[PATCH] D158064: [IR] Add PHINode::removeIncomingValueIf() (NFC)

[Nikita Popov via Phabricator via llvm-commits]

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Add an API that allows removing multiple incoming phi values based on a predicate callback, as suggested on D157621 <https://reviews.llvm.org/D157621>.

This makes sure that the removal is linear time rather than quadratic, and avoids subtleties around iterator invalidation.

I have replaced some of the more straightforward users with the new API, though there's a couple more places that should be able to use it.


https://reviews.llvm.org/D158064

Files:
  llvm/include/llvm/IR/Instructions.h
  llvm/lib/IR/Instructions.cpp
  llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp
  llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
  llvm/lib/Transforms/Utils/LoopSimplify.cpp
  llvm/lib/Transforms/Utils/LoopUtils.cpp
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp

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