[PATCH] D106498: AMDGPU: Treat IMPLICIT_DEF like a constant lanemask source

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

Seems to cause 2 lit test failures on my Release+Asserts build:

  LLVM :: CodeGen/AMDGPU/loop_break.ll
  LLVM :: CodeGen/AMDGPU/sgpr-control-flow.ll


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106498/new/

https://reviews.llvm.org/D106498