diff --git a/.github/workflows/build-ci-container.yml b/.github/workflows/build-ci-container.yml
deleted file mode 100644
index 3f2bf57eb850..000000000000
--- a/.github/workflows/build-ci-container.yml
+++ /dev/null
@@ -1,108 +0,0 @@
-name: Build CI Container
-
-permissions:
-  contents: read
-
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - .github/workflows/build-ci-container.yml
-      - '.github/workflows/containers/github-action-ci/**'
-  pull_request:
-    branches:
-      - main
-    paths:
-      - .github/workflows/build-ci-container.yml
-      - '.github/workflows/containers/github-action-ci/**'
-
-jobs:
-  # TODO(boomanaiden154): Switch this back to a single stage build when we can
-  # run this on the self-hosted runners and don't have to do it this way to
-  # avoid timeouts.
-  build-ci-container-stage1:
-    if: github.repository_owner == 'llvm'
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout LLVM
-        uses: actions/checkout@v4
-        with:
-          sparse-checkout: .github/workflows/containers/github-action-ci/
-      - name: Change podman Root Direcotry
-        run: |
-          mkdir -p ~/.config/containers
-          sudo mkdir -p /mnt/podman
-          sudo chown `whoami`:`whoami` /mnt/podman
-          cp ./.github/workflows/containers/github-action-ci/storage.conf ~/.config/containers/storage.conf
-          podman info
-      - name: Build container stage1
-        working-directory: ./.github/workflows/containers/github-action-ci/
-        run: |
-          podman build -t stage1-toolchain --target stage1-toolchain -f stage1.Dockerfile .
-      - name: Save container image
-        run: |
-          podman save stage1-toolchain > stage1-toolchain.tar
-      - name: Upload container image
-        uses: actions/upload-artifact@v4
-        with:
-          name: stage1-toolchain
-          path: stage1-toolchain.tar
-          retention-days: 1
-  build-ci-container-stage2:
-    if: github.repository_owner == 'llvm'
-    runs-on: ubuntu-latest
-    needs: build-ci-container-stage1
-    permissions:
-      packages: write
-    steps:
-      - name: Write Variables
-        id: vars
-        run: |
-          tag=`date +%s`
-          container_name="ghcr.io/$GITHUB_REPOSITORY_OWNER/ci-ubuntu-22.04"
-          echo "container-name=$container_name" >> $GITHUB_OUTPUT
-          echo "container-name-tag=$container_name:$tag" >> $GITHUB_OUTPUT
-
-      - name: Checkout LLVM
-        uses: actions/checkout@v4
-        with:
-          sparse-checkout: .github/workflows/containers/github-action-ci/
-
-      - name: Change podman Root Direcotry
-        run: |
-          mkdir -p ~/.config/containers
-          sudo mkdir -p /mnt/podman
-          sudo chown `whoami`:`whoami` /mnt/podman
-          cp ./.github/workflows/containers/github-action-ci/storage.conf ~/.config/containers/storage.conf
-          podman info
-
-      - name: Download stage1-toolchain
-        uses: actions/download-artifact@v4
-        with:
-          name: stage1-toolchain
-
-      - name: Load stage1-toolchain
-        run: |
-          podman load -i stage1-toolchain.tar
-
-      - name: Build Container
-        working-directory: ./.github/workflows/containers/github-action-ci/
-        run: |
-          podman build -t ${{ steps.vars.outputs.container-name-tag }} -f stage2.Dockerfile .
-          podman tag ${{ steps.vars.outputs.container-name-tag }} ${{ steps.vars.outputs.container-name }}:latest
-
-      - name: Test Container
-        run: |
-          for image in ${{ steps.vars.outputs.container-name-tag }} ${{  steps.vars.outputs.container-name }}; do
-            podman run --rm -it $image /usr/bin/bash -x -c 'printf '\''#include <iostream>\nint main(int argc, char **argv) { std::cout << "Hello\\n"; }'\'' | clang++ -x c++ - && ./a.out | grep Hello'
-          done
-
-      - name: Push Container
-        if: github.event_name == 'push'
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          podman login -u ${{ github.actor }} -p $GITHUB_TOKEN ghcr.io
-          podman push ${{ steps.vars.outputs.container-name-tag }}
-          podman push ${{ steps.vars.outputs.container-name }}:latest
diff --git a/.github/workflows/containers/github-action-ci/bootstrap.patch b/.github/workflows/containers/github-action-ci/bootstrap.patch
deleted file mode 100644
index 55631c54a396..000000000000
--- a/.github/workflows/containers/github-action-ci/bootstrap.patch
+++ /dev/null
@@ -1,13 +0,0 @@
-diff --git a/clang/cmake/caches/BOLT-PGO.cmake b/clang/cmake/caches/BOLT-PGO.cmake
-index 1a04ca9a74e5..d092820e4115 100644
---- a/clang/cmake/caches/BOLT-PGO.cmake
-+++ b/clang/cmake/caches/BOLT-PGO.cmake
-@@ -4,6 +4,8 @@ set(CLANG_BOOTSTRAP_TARGETS
-   stage2-clang-bolt
-   stage2-distribution
-   stage2-install-distribution
-+  clang
-+  lld
-   CACHE STRING "")
- set(BOOTSTRAP_CLANG_BOOTSTRAP_TARGETS
-   clang-bolt
diff --git a/.github/workflows/containers/github-action-ci/stage1.Dockerfile b/.github/workflows/containers/github-action-ci/stage1.Dockerfile
deleted file mode 100644
index fbc4548e6636..000000000000
--- a/.github/workflows/containers/github-action-ci/stage1.Dockerfile
+++ /dev/null
@@ -1,44 +0,0 @@
-FROM docker.io/library/ubuntu:22.04 as base
-ENV LLVM_SYSROOT=/opt/llvm
-
-FROM base as stage1-toolchain
-ENV LLVM_VERSION=17.0.6
-
-RUN apt-get update && \
-    apt-get install -y \
-    wget \
-    gcc \
-    g++ \
-    cmake \
-    ninja-build \
-    python3 \
-    git \
-    curl
-
-RUN curl -O -L https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-$LLVM_VERSION.tar.gz && tar -xf llvmorg-$LLVM_VERSION.tar.gz
-
-WORKDIR /llvm-project-llvmorg-$LLVM_VERSION
-
-COPY bootstrap.patch /
-
-# TODO(boomanaiden154): Remove the patch pulled from a LLVM PR once we bump
-# the toolchain to version 18 and the patch is in-tree.
-# TODO(boomanaiden154): Remove the bootstrap patch once we unsplit the build
-# and no longer need to explicitly build the stage2 dependencies.
-RUN curl https://github.com/llvm/llvm-project/commit/dd0356d741aefa25ece973d6cc4b55dcb73b84b4.patch | patch -p1 && cat /bootstrap.patch | patch -p1
-
-RUN mkdir build
-
-RUN cmake -B ./build -G Ninja ./llvm \
-  -C ./clang/cmake/caches/BOLT-PGO.cmake \
-  -DBOOTSTRAP_LLVM_ENABLE_LLD=ON \
-  -DBOOTSTRAP_BOOTSTRAP_LLVM_ENABLE_LLD=ON \
-  -DPGO_INSTRUMENT_LTO=Thin \
-  -DLLVM_ENABLE_RUNTIMES="compiler-rt" \
-  -DCMAKE_INSTALL_PREFIX="$LLVM_SYSROOT" \
-  -DLLVM_ENABLE_PROJECTS="bolt;clang;lld;clang-tools-extra" \
-  -DLLVM_DISTRIBUTION_COMPONENTS="lld;compiler-rt;clang-format" \
-  -DCLANG_DEFAULT_LINKER="lld" \
-  -DBOOTSTRAP_CLANG_PGO_TRAINING_DATA_SOURCE_DIR=/llvm-project-llvmorg-$LLVM_VERSION/llvm
-
-RUN ninja -C ./build stage2-instrumented-clang stage2-instrumented-lld
diff --git a/.github/workflows/containers/github-action-ci/stage2.Dockerfile b/.github/workflows/containers/github-action-ci/stage2.Dockerfile
deleted file mode 100644
index e1a06cb68a58..000000000000
--- a/.github/workflows/containers/github-action-ci/stage2.Dockerfile
+++ /dev/null
@@ -1,27 +0,0 @@
-FROM docker.io/library/ubuntu:22.04 as base
-ENV LLVM_SYSROOT=/opt/llvm
-
-FROM stage1-toolchain AS stage2-toolchain
-
-RUN ninja -C ./build stage2-clang-bolt stage2-install-distribution && ninja -C ./build install-distribution && rm -rf ./build
-
-FROM base
-
-COPY --from=stage2-toolchain $LLVM_SYSROOT $LLVM_SYSROOT
-
-# Need to install curl for hendrikmuhs/ccache-action
-# Need nodejs for some of the GitHub actions.
-# Need perl-modules for clang analyzer tests.
-RUN apt-get update && \
-    apt-get install -y \
-    binutils \
-    cmake \
-    curl \
-    libstdc++-11-dev \
-    ninja-build \
-    nodejs \
-    perl-modules \
-    python3-psutil
-
-ENV LLVM_SYSROOT=$LLVM_SYSROOT
-ENV PATH=${LLVM_SYSROOT}/bin:${PATH}
diff --git a/.github/workflows/containers/github-action-ci/storage.conf b/.github/workflows/containers/github-action-ci/storage.conf
deleted file mode 100644
index 60f295ff1e96..000000000000
--- a/.github/workflows/containers/github-action-ci/storage.conf
+++ /dev/null
@@ -1,4 +0,0 @@
-[storage]
-  driver = "overlay"
-  runroot = "/mnt/podman/container"
-  graphroot = "/mnt/podman/image"
diff --git a/.github/workflows/email-check.yaml b/.github/workflows/email-check.yaml
deleted file mode 100644
index e0a0506082b8..000000000000
--- a/.github/workflows/email-check.yaml
+++ /dev/null
@@ -1,44 +0,0 @@
-name: "Check for private emails used in PRs"
-
-on:
-  pull_request_target:
-    types:
-      - opened
-
-permissions:
-  contents: read
-
-jobs:
-  validate_email:
-    permissions:
-      pull-requests: write
-    runs-on: ubuntu-latest
-    if: github.repository == 'llvm/llvm-project'
-    steps:
-      - name: Fetch LLVM sources
-        uses: actions/checkout@v4
-        with:
-          ref: ${{ github.event.pull_request.head.sha }}
-
-      - name: Extract author email
-        id: author
-        run: |
-          git log -1
-          echo "EMAIL=$(git show -s --format='%ae' HEAD~0)" >> $GITHUB_OUTPUT
-
-      - name: Validate author email
-        if: ${{ endsWith(steps.author.outputs.EMAIL, 'noreply.github.com')  }}
-        uses: actions/github-script@v7
-        env:
-          EMAIL: ${{ steps.author.outputs.EMAIL }}
-        with:
-          script: |
-            const { EMAIL } = process.env
-            await github.rest.issues.createComment({
-              issue_number: context.issue.number,
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              body: `⚠️ We detected that you are using a GitHub private e-mail address to contribute to the repo.
-              Please turn off [Keep my email addresses private](https://github.com/settings/emails) setting in your account.
-              See [LLVM Discourse](https://discourse.llvm.org/t/hidden-emails-on-github-should-we-do-something-about-it) for more information.
-            `})
diff --git a/.github/workflows/libclang-python-tests.yml b/.github/workflows/libclang-python-tests.yml
deleted file mode 100644
index 497f6ca5c554..000000000000
--- a/.github/workflows/libclang-python-tests.yml
+++ /dev/null
@@ -1,47 +0,0 @@
-name: Libclang Python Binding Tests
-
-permissions:
-  contents: read
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - 'main'
-    paths:
-      - 'clang/bindings/python/**'
-      - 'clang/tools/libclang/**'
-      - 'clang/CMakeList.txt'
-      - '.github/workflows/libclang-python-tests.yml'
-      - '.github/workflows/llvm-project-tests.yml'
-  pull_request:
-    paths:
-      - 'clang/bindings/python/**'
-      - 'clang/tools/libclang/**'
-      - 'clang/CMakeList.txt'
-      - '.github/workflows/libclang-python-tests.yml'
-      - '.github/workflows/llvm-project-tests.yml'
-
-concurrency:
-  # Skip intermediate builds: always.
-  # Cancel intermediate builds: only if it is a pull request build.
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
-
-jobs:
-  check-clang-python:
-    # Build libclang and then run the libclang Python binding's unit tests.
-    name: Build and run Python unit tests
-    if: github.repository == 'llvm/llvm-project'
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: ["3.7", "3.11"]
-    uses: ./.github/workflows/llvm-project-tests.yml
-    with:
-      build_target: check-clang-python
-      projects: clang
-      # There is an issue running on "windows-2019".
-      # See https://github.com/llvm/llvm-project/issues/76601#issuecomment-1873049082.
-      os_list: '["ubuntu-latest"]'
-      python_version: ${{ matrix.python-version }}
diff --git a/.github/workflows/llvm-project-workflow-tests.yml b/.github/workflows/llvm-project-workflow-tests.yml
deleted file mode 100644
index a2539b279be0..000000000000
--- a/.github/workflows/llvm-project-workflow-tests.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-# This workflow will test the llvm-project-tests workflow in PRs
-# targetting the main branch.  Since this workflow doesn't normally
-# run on main PRs, we need some way to test it to ensure new updates
-# don't break it.
-
-name: LLVM Workflow Test
-
-permissions:
-  contents: read
-
-on:
-  pull_request:
-    branches:
-      - 'main'
-    paths:
-      - '.github/workflows/llvm-project-tests.yml'
-      - '.github/workflows/llvm-project-workflow-tests.yml'
-
-concurrency:
-  # Skip intermediate builds: always.
-  # Cancel intermediate builds: only if it is a pull request build.
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
-
-jobs:
-  llvm-test:
-    if: github.repository_owner == 'llvm'
-    name: Build and Test
-    uses: ./.github/workflows/llvm-project-tests.yml
-    with:
-      build_target: check-all
-      projects: clang;lld;libclc;lldb
diff --git a/.github/workflows/merged-prs.yml b/.github/workflows/merged-prs.yml
deleted file mode 100644
index 37fc6c67f000..000000000000
--- a/.github/workflows/merged-prs.yml
+++ /dev/null
@@ -1,41 +0,0 @@
-name: "Add buildbot information to first PRs from new contributors"
-
-permissions:
-  contents: read
-
-on:
-  # It's safe to use pull_request_target here, because we aren't checking out
-  # code from the pull request branch.
-  # See https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
-  pull_request_target:
-    types:
-      - closed
-
-jobs:
-  buildbot_comment:
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-    if: >-
-      (github.repository == 'llvm/llvm-project') &&
-      (github.event.pull_request.merged == true)
-    steps:
-      - name: Checkout Automation Script
-        uses: actions/checkout@v4
-        with:
-          sparse-checkout: llvm/utils/git/
-          ref: main
-
-      - name: Setup Automation Script
-        working-directory: ./llvm/utils/git/
-        run: |
-          pip install -r requirements.txt
-
-      - name: Add Buildbot information comment
-        working-directory: ./llvm/utils/git/
-        run: |
-          python3 ./github-automation.py \
-            --token '${{ secrets.GITHUB_TOKEN }}' \
-            pr-buildbot-information \
-            --issue-number "${{ github.event.pull_request.number }}" \
-            --author "${{ github.event.pull_request.user.login }}"
diff --git a/.github/workflows/release-documentation.yml b/.github/workflows/release-documentation.yml
deleted file mode 100644
index 02ffbb142a94..000000000000
--- a/.github/workflows/release-documentation.yml
+++ /dev/null
@@ -1,88 +0,0 @@
-name: Release Documentation
-
-permissions:
-  contents: read
-
-on:
-  workflow_dispatch:
-    inputs:
-      release-version:
-        description: 'Release Version'
-        required: true
-        type: string
-      upload:
-        description: 'Upload documentation'
-        required: false
-        type: boolean
-
-  workflow_call:
-    inputs:
-      release-version:
-        description: 'Release Version'
-        required: true
-        type: string
-      upload:
-        description: 'Upload documentation'
-        required: false
-        type: boolean
-
-jobs:
-  release-documentation:
-    name: Build and Upload Release Documentation
-    runs-on: ubuntu-latest
-    env:
-      upload: ${{ inputs.upload && !contains(inputs.release-version, 'rc') }}
-    steps:
-      - name: Checkout LLVM
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-
-      - name: Setup Python env
-        uses: actions/setup-python@v5
-        with:
-          cache: 'pip'
-          cache-dependency-path: './llvm/docs/requirements.txt'
-
-      - name: Install Dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y \
-              graphviz \
-              python3-github \
-              ninja-build \
-              texlive-font-utils
-          pip3 install --user -r ./llvm/docs/requirements.txt
-
-      - name: Build Documentation
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-        run: |
-          ./llvm/utils/release/build-docs.sh -release "${{ inputs.release-version }}" -no-doxygen
-
-      - name: Create Release Notes Artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: release-notes
-          path: docs-build/html-export/
-
-      - name: Clone www-releases
-        if: env.upload
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-        with:
-          repository: ${{ github.repository_owner }}/www-releases
-          ref: main
-          fetch-depth: 0
-          path: www-releases
-
-      - name: Upload Release Notes
-        if: env.upload
-        env:
-          WWW_RELEASES_TOKEN: ${{ secrets.WWW_RELEASES_TOKEN }}
-        run: |
-          mkdir -p ../www-releases/${{ inputs.release-version }}
-          mv ./docs-build/html-export/* ../www-releases/${{ inputs.release-version }}
-          cd ../www-releases
-          git add ${{ inputs.release-version }}
-          git config user.email "llvmbot@llvm.org"
-          git config user.name "llvmbot"
-          git commit -a -m "Add ${{ inputs.release-version }} documentation"
-          git push "https://$WWW_RELEASES_TOKEN@github.com/${{ github.repository_owner }}/www-releases" main:main
diff --git a/.github/workflows/release-doxygen.yml b/.github/workflows/release-doxygen.yml
deleted file mode 100644
index f39822bdff38..000000000000
--- a/.github/workflows/release-doxygen.yml
+++ /dev/null
@@ -1,67 +0,0 @@
-name: Release Doxygen
-
-permissions:
-  contents: read
-
-on:
-  workflow_dispatch:
-    inputs:
-      release-version:
-        description: 'Release Version'
-        required: true
-        type: string
-      upload:
-        description: 'Upload documentation'
-        required: false
-        type: boolean
-
-  workflow_call:
-    inputs:
-      release-version:
-        description: 'Release Version'
-        required: true
-        type: string
-      upload:
-        description: 'Upload documentation'
-        required: false
-        type: boolean
-
-jobs:
-  release-doxygen:
-    name: Build and Upload Release Doxygen
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-    env:
-      upload: ${{ inputs.upload && !contains(inputs.release-version, 'rc') }}
-    steps:
-      - name: Checkout LLVM
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-
-      - name: Setup Python env
-        uses: actions/setup-python@v5
-        with:
-          cache: 'pip'
-          cache-dependency-path: './llvm/docs/requirements.txt'
-
-      - name: Install Dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y \
-              doxygen \
-              graphviz \
-              python3-github \
-              ninja-build \
-              texlive-font-utils
-          pip3 install --user -r ./llvm/docs/requirements.txt
-
-      - name: Build Doxygen
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-        run: |
-          ./llvm/utils/release/build-docs.sh -release "${{ inputs.release-version }}" -no-sphinx
-
-      - name: Upload Doxygen
-        if: env.upload
-        run: |
-          ./llvm/utils/release/github-upload-release.py --token "$GITHUB_TOKEN" --release "${{ inputs.release-version }}" --user "${{ github.actor }}" upload --files ./*doxygen*.tar.xz
diff --git a/.github/workflows/release-lit.yml b/.github/workflows/release-lit.yml
deleted file mode 100644
index 36b0b6edd518..000000000000
--- a/.github/workflows/release-lit.yml
+++ /dev/null
@@ -1,74 +0,0 @@
-name: Release Lit
-
-permissions:
-  contents: read
-
-on:
-  workflow_dispatch:
-    inputs:
-      release-version:
-        description: 'Release Version'
-        required: true
-        type: string
-
-  workflow_call:
-    inputs:
-      release-version:
-        description: 'Release Version'
-        required: true
-        type: string
-
-jobs:
-  release-lit:
-    name: Release Lit
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout LLVM
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-        with:
-          ref: "llvmorg-${{ inputs.release-version }}"
-
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y python3-setuptools python3-psutil python3-github
-
-      - name: Check Permissions
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-        run: |
-          ./llvm/utils/release/./github-upload-release.py --token "$GITHUB_TOKEN" --user ${{ github.actor }} check-permissions
-
-      - name: Setup Cpp
-        uses: aminya/setup-cpp@v1
-        with:
-          compiler: llvm-16.0.6
-          cmake: true
-          ninja: true
-
-      - name: Test lit
-        run: |
-          mkdir build && cd build
-          export FILECHECK_OPTS='-dump-input-filter=all -vv -color'
-          cmake ../llvm -DCMAKE_BUILD_TYPE=Release -G Ninja
-          ninja -v -j $(nproc) check-lit
-
-      - name: Package lit
-        run: |
-          cd llvm/utils/lit
-          # Remove 'dev' suffix from lit version.
-          sed -i 's/ + "dev"//g' lit/__init__.py
-          python3 setup.py sdist
-
-      - name: Upload lit to test.pypi.org
-        uses: pypa/gh-action-pypi-publish@release/v1
-        with:
-          password: ${{ secrets.LLVM_LIT_TEST_PYPI_API_TOKEN }}
-          repository-url: https://test.pypi.org/legacy/
-          packages-dir: llvm/utils/lit/dist/
-
-      - name: Upload lit to pypi.org
-        uses: pypa/gh-action-pypi-publish@release/v1
-        with:
-          password: ${{ secrets.LLVM_LIT_PYPI_API_TOKEN }}
-          packages-dir: llvm/utils/lit/dist/