[PATCH] D40183: [AMDGPU] Waitcnt pass. Add S_WAITCNT 0 if incomplete predecessor info

[Mark Searles via Phabricator via llvm-commits]

msearles updated this revision to Diff 123383.

https://reviews.llvm.org/D40183

Files:
  lib/Target/AMDGPU/SIInsertWaitcnts.cpp
  test/CodeGen/AMDGPU/waitcnt-no-preds.ll

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