[GenericDomTree] Change GenericDomTree to use NodeRef in GraphTraits. NFC.

Summary:
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.

Reviewers: dblaikie, chandlerc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D23593

llvm-svn: 278961

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/lib/IR/Dominators.cpp b/llvm/lib/IR/Dominators.cpp
index 5c3a2de95c5..c70c589e799 100644
--- a/llvm/lib/IR/Dominators.cpp
+++ b/llvm/lib/IR/Dominators.cpp
@@ -64,9 +64,13 @@ template class llvm::DomTreeNodeBase<BasicBlock>;
 template class llvm::DominatorTreeBase<BasicBlock>;
 
 template void llvm::Calculate<Function, BasicBlock *>(
-    DominatorTreeBase<GraphTraits<BasicBlock *>::NodeType> &DT, Function &F);
+    DominatorTreeBase<
+        typename std::remove_pointer<GraphTraits<BasicBlock *>::NodeRef>::type>
+        &DT,
+    Function &F);
 template void llvm::Calculate<Function, Inverse<BasicBlock *>>(
-    DominatorTreeBase<GraphTraits<Inverse<BasicBlock *>>::NodeType> &DT,
+    DominatorTreeBase<typename std::remove_pointer<
+        GraphTraits<Inverse<BasicBlock *>>::NodeRef>::type> &DT,
     Function &F);
 
 // dominates - Return true if Def dominates a use in User. This performs