feat(Backend, MemBlock): add support for Zacas extension #3958
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In the previous design, AtomicsUnit receives stds from StdExeUnit and arbitrate at most one std uop for one cycle. This works fine on most of the AMOs and LR/SC because they require only one std uop. However AMOCAS requires at least two std uops, which may be issued from two separate issue queues at the same time, leading to the loss of std uops. This commit fixes this by taking all the outputs of the StdExeUnits into account with arbitration logics.
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