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This patch makes MemorySSA recognize atomic/volatile loads, and makes MSSA treat said loads specially. This allows us to be a bit more aggressive in some cases. Administrative note: Revision was LGTM'ed by reames in person. Additionally, this doesn't include the `invariant.load` recognition in the differential revision, because I feel it's better to commit that separately. Will commit soon. Differential Revision: https://reviews.llvm.org/D16875 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277637 91177308-0d34-0410-b5e6-96231b3b80d8
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