[PATCH] D111831: [amdgpu] Fix a crash case when preserving MDT in SILowerControlFlow

[Michael Liao via Phabricator via llvm-commits]

hliao created this revision.
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- When a redundant MBB is being erased from MDT, check whether its single successor is dominiated by it. If yes, update that successor's idom before erasing MBB; otherwise, it implies MBB is a leaf node and could be erased directly.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111831

Files:
  llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
  llvm/test/CodeGen/AMDGPU/mdt-preserving-crash.ll

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