[PATCH] D49097: [RegisterCoalescer] Another fix for subrange join unreachable

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz added a comment.

We may need to guard this code with some extra checks (to verify that we have merged a non-undef value with an undef one), to avoid doing this unnecessarily, but I don't think there is a much simpler way to handle it.


Repository:
  rL LLVM

https://reviews.llvm.org/D49097