[PATCH] D94780: [ARM][Block placement] Check the predecessor exists before processing it

[Sam Tebbs via Phabricator via llvm-commits]

samtebbs created this revision.
samtebbs added reviewers: dmgreen, SjoerdMeijer, samparker.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
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Not all machine loops will have a predecessor. so the pass needs to
check it before continuing.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94780

Files:
  llvm/lib/Target/ARM/ARMBlockPlacement.cpp
  llvm/test/CodeGen/Thumb2/block-placement.mir

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