[PATCH] D138483: [CodeGen] Use poison instead of undef as placeholder in AtomicExpandPass [NFC]

[Nico Weber via Phabricator via llvm-commits]

thakis added a comment.

This breaks tests everywhere: http://45.33.8.238/linux/92107/step_12.txt

Please take a look and revert for now if it takes a while to fix.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D138483/new/

https://reviews.llvm.org/D138483