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Commit d5582556 authored by Phoebe Wang's avatar Phoebe Wang
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[X86] Use lock add/sub for cases that we only care about the EFLAGS 

This fixes #36373, #36905 and partial of #58685.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D137711
parent d856e5fe
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