[PATCH] D136305: llvm-reduce: Fix producing invalid reductions with landingpads

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: regehr, aeubanks, lebedev.ri.
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It's not valid to simply branch to a landingpad block, so it
needs to be removed.

Also stop trying to scan forward to find a block that can be merged.
The predecessor merge rules are more complex than this. This also
would need to have considered landingpads. Just do the minimum
to delete the block, and let the simplify-cfg reduction handle
the branch chain cleanups.


https://reviews.llvm.org/D136305

Files:
  llvm/test/tools/llvm-reduce/remove-bbs-sequence.ll
  llvm/test/tools/llvm-reduce/remove-bbs-unwinded-to.ll
  llvm/tools/llvm-reduce/deltas/ReduceBasicBlocks.cpp

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