[PATCH] D48102: Improve handling of COPY instructions with identical value numbers

[Tim Renouf via Phabricator via llvm-commits]

tpr added a comment.

It was a copy at the point that joinCopy was called, but eliminateUndefCopy changed it to implicit_def.

Good idea re isImplicitDef().


Repository:
  rL LLVM

https://reviews.llvm.org/D48102