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0760338efa
MemorySSA currently treats lifetime.end intrinsics as not aliasing anything. This breaks MemorySSA-based MemCpyOpt, because we'll happily move a read of a pointer below a lifetime.end intrinsic, as no clobber is reported. I think the MemorySSA modelling here isn't correct: lifetime.end(p) has approximately the same effect as doing a memcpy(p, undef), and should be treated as a clobber. This patch removes the special handling of lifetime.end, leaving alias analysis to handle it appropriately. Differential Revision: https://reviews.llvm.org/D95763
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