[PATCH] D142339: [X86] Fix `FindSingleBitChange` to handle NOT(V) where V is not an Instruction

[Noah Goldstein via Phabricator via llvm-commits]

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Was previously buggy to assume that NOT'd Value was always an
instruction. If the NOT'd value is not an Instruction, we should just
return as its either a constant, in which can we will re-run the logic
after constant-folding, or its a type we can't evaluate anyways.

This is a follow up to: `D140939`


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142339

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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