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a10c01a6c6
Swift cores implement store barriers that are stronger than the ARM specification but weaker than general barriers. They are, in fact, just about enough to provide the ordering needed for atomic operations with release semantics. This patch makes use of that quirk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185527 91177308-0d34-0410-b5e6-96231b3b80d8