Alex Richardson 6277bd75dc [compiler-rt] Fix atomic_test.c on macOS
The macOS name mangling adds another underscore. Therefore, on macOS
the __atomic_* functions are actually ___atomic_* in libcompiler_rt.dylib.
To handle this case, prepend the asm() argument with __USER_LABEL_PREFIX__
in the same way that atomic.c does.

Reviewed By: ldionne

Differential Revision: https://reviews.llvm.org/D92833
2020-12-22 11:56:20 +00:00
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