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18b8cfa7ee
The lowering isn't really an optimization, so optnone shouldn't make a difference. ARM relies on the pass running when using "-mthread-model single", because in that mode, it doesn't run AtomicExpand. See bug for more details. Differential Revision: https://reviews.llvm.org/D37040 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311565 91177308-0d34-0410-b5e6-96231b3b80d8