[PATCH] D23146: [ADT] Migrate DepthFirstIterator to use NodeRef

[Tim Shen via llvm-commits]

timshen created this revision.
timshen added reviewers: dblaikie, chandlerc.
timshen added a subscriber: llvm-commits.
Herald added a subscriber: mzolotukhin.

Notice that the data layout is changed: instead of using
std::pair<PointerIntPair<NodeType*, 1>, ChildItTy>, now use
std::pair<NodeRef, Optional<ChildItTy>>.

A NFC but worth noticing change is operator==(), since we only compare
an iterator against end(), it's better to put an assert there and make
people noticed when it fails.

https://reviews.llvm.org/D23146

Files:
  include/llvm/ADT/DepthFirstIterator.h
  include/llvm/Analysis/LoopInfo.h
  include/llvm/Analysis/RegionIterator.h
  include/llvm/CodeGen/MachineDominators.h
  include/llvm/CodeGen/MachineLoopInfo.h
  include/llvm/IR/Dominators.h

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