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

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n added a comment.

1. Verified that all the tests failed before this commit (and pass afterwards).
2. Is revert of `D140939` and `D142166` preferable? I've already swung and missed so LMK if it's better.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D142339/new/

https://reviews.llvm.org/D142339