[CIR][TargetLowering] Fix use iteration #1162
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Based on https://mlir.llvm.org/docs/Tutorials/UnderstandingTheIRStructure/#traversing-the-def-use-chains, the users of an op are linked together in a doubly-linked list, so replacing a user while iterating the users causes a use-after-free. Store the users in a worklist and process them afterwards instead to avoid this.
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Based on https://mlir.llvm.org/docs/Tutorials/UnderstandingTheIRStructure/#traversing-the-def-use-chains,
the users of an op are linked together in a doubly-linked list, so
replacing a user while iterating the users causes a use-after-free.
Store the users in a worklist and process them afterwards instead to
avoid this.