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Commit bf56c0a5 authored by Xinliang David Li's avatar Xinliang David Li
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[PGO] Add cmake check to determine atomics op availability 

This allows the profile runtime to pick the right impl
for cmp&swap for a given target.

Differential Revision: http://reviews.llvm.org/D15248

llvm-svn: 255173
parent 3d9f89f0
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