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[libc] Disable atomic optimizations for
libc
AMDGPU builds
Recently the AMDGPU backend automatically enables a pass to optimize atomics. This results in the LTO build taking about 10x longer in all cases. For now we disable this by default as was the case before the patch in D152649. Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D153232
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