[PATCH] D127516: RegisterCoalescer: Fix verifier error when merging copy of undef

[Matthias Braun via Phabricator via llvm-commits]

MatzeB accepted this revision.
MatzeB added a comment.
This revision is now accepted and ready to land.

I still feel like I don't fully understand why the change in `undef-subreg-use-after-coalesce.mir` makes things better, but either way the code changes seem reasonable and in the interest of not blocking this any further, go ahead! LGTM


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D127516/new/

https://reviews.llvm.org/D127516