[PATCH] D42854: [AMDGPU] Suppress redundant waitcnt instrs

[Mark Searles via Phabricator via llvm-commits]

msearles updated this revision to Diff 133104.
msearles edited the summary of this revision.
msearles added a comment.

- Don't remove existing waitcnt instrs; if a redundant is to be inserted, keep the existing waitcnt and don't insert the duplicate.
- Fix mir test


https://reviews.llvm.org/D42854

Files:
  lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  lib/Target/AMDGPU/SIInsertWaitcnts.cpp
  test/CodeGen/AMDGPU/waitcnt-no-redundant.mir

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