[PATCH] D89397: [AMDGPU] SILowerControlFlow::removeMBBifRedundant should not try to change MBB layout if it can fallthrough

[Alexander via Phabricator via llvm-commits]

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removeMBBifRedundant normally tries to keep predecessors fallthrough when removing redundant MBB.

  It has to change MBBs layout to keep the new successor to immediately follow the predecessor of removed MBB.
  It only may be allowed in case the new successor itself has no successors to which it fall through.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89397

Files:
  llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
  llvm/test/CodeGen/AMDGPU/collapse-endcf.mir

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