[PATCH] D150210: [CodeGenPrepare] Fix for using outdated/corrupt LoopInfo

[Momchil Velikov via Phabricator via llvm-commits]

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Some transformation in CodeGenPrepare pass may create and/or delete
basic block, but they don't update the LoopInfo, so the LoopInfo may
end up containing dangling pointers and sometimes reused basic blocks,
which leads to "interesting" non-deterministic behaviour.

This patch makes the pass invalidate the LoopInfo whenever the
DominationTree is invalidated and lazily rebuilds it.


https://reviews.llvm.org/D150210

Files:
  llvm/lib/CodeGen/CodeGenPrepare.cpp

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