[PATCH] D137711: [X86] Use lock add/sub for cases that we only care about the EFLAGS

[Phoebe Wang via Phabricator via llvm-commits]

pengfei created this revision.
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This fixes #36373, #36905 and partial of #58685.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137711

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/include/llvm/IR/IntrinsicsX86.td
  llvm/lib/CodeGen/AtomicExpandPass.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/test/CodeGen/X86/pr37025.ll
  llvm/test/CodeGen/X86/pr58685.ll

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