[PATCH] D113081: [LowerSwitch] Delete all new dead blocks accurately

[Yilong Guo via Phabricator via llvm-commits]

Nuullll created this revision.
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https://llvm.org/pr52383

LowerSwitch should be responsible for removing all newly introduced dead blocks.
The original implementation only deleted the unreachable default block itself, leaving
its dominatee-successors (if any) unreachable.

This patch uses DominatorTree so that we know the accurate set of blocks that need to
be removed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113081

Files:
  llvm/lib/Transforms/Utils/LowerSwitch.cpp
  llvm/test/Transforms/LowerSwitch/delete-all-new-dead-blocks.ll
  llvm/test/Transforms/Util/lowerswitch.ll

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