AMDGPU/InsertWaitcnts: Update VGPR/SGPR bounds when brackets are merged
Summary:
Fix an issue where VGPR/SGPR bounds are not properly extended when brackets are merged.
This manifests as missing waitcnt insertions when multiple brackets are forwarded to a successor block and the first forward has lower VGPR/SGPR bounds.
Irreducible loop test has been extended based on a CTS failure detected for GFX9.
Reviewers: nhaehnle
Reviewed By: nhaehnle
Subscribers: arsenm, kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, t-tye, jfb, llvm-commits
Differential Revision: https://reviews.llvm.org/D55602
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349611
91177308-0d34-0410-b5e6-
96231b3b80d8
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