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9e251d6d41
We construct a temporary "atomicrmw xchg" instruction when lowering atomic stores for widths that aren't supported natively. This isn't on the top-level worklist though, so it won't be removed automatically and we have to do it ourselves once that itself has been lowered. Thanks Saleem for pointing this out! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212948 91177308-0d34-0410-b5e6-96231b3b80d8