[PATCH] D95500: [AMDGPU] Fix WMM Entry SCC preservation

[Carl Ritson via Phabricator via llvm-commits]

critson created this revision.
critson added reviewers: piotr, foad.
Herald added subscribers: kerbowa, hiraditya, t-tye, tpr, dstuttard, yaxunl, nhaehnle, jvesely, kzhuravl, arsenm.
critson requested review of this revision.
Herald added subscribers: llvm-commits, wdng.
Herald added a project: LLVM.

SCC was not correctly preserved when entering WWM.
Current lit test was unable to detect this as entry block is
handled differently.
Additionally fix an issue where SCC was unnecessarily preserved
when exiting from WWM to Exact mode.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95500

Files:
  llvm/lib/Target/AMDGPU/SIWholeQuadMode.cpp
  llvm/test/CodeGen/AMDGPU/wqm.mir

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