[PATCH] D142166: [X86] In `shouldExpandLogicAtomicRMWInIR` return `CmpXChg` instead of asserting if we don't match op(0)

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n updated this revision to Diff 490710.
goldstein.w.n added a comment.

Make this fix complete


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D142166/new/

https://reviews.llvm.org/D142166

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/atomic-rm-bit-test-64.ll
  llvm/test/CodeGen/X86/atomic-rm-bit-test.ll

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