[PATCH] D23593: [GenericDomTree] Change GenericDomTree to use NodeRef in GraphTraits. NFC.

[Tim Shen via llvm-commits]

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

Looking at the implementation, GenericDomTree has more specific
requirements on NodeRef, e.g. NodeRefObject->getParent() should compile,
and NodeRef should be a pointer. We can remove the pointer requirement,
but it seems to have little gain, given the limited use cases.

Also changed GraphTraits<Inverse<Inverse<T>> to be more accurate.

https://reviews.llvm.org/D23593

Files:
  include/llvm/ADT/GraphTraits.h
  include/llvm/IR/Dominators.h
  include/llvm/Support/GenericDomTree.h
  include/llvm/Support/GenericDomTreeConstruction.h
  lib/IR/Dominators.cpp

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