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
Summary: By generalize the interface, users are able to inject more flexible Node token into the algorithm, for example, a pair of vector<Node>* and index integer. Currently I only migrated SCCIterator to use NodeRef, but more is coming. It's a NFC. Reviewers: dblaikie, chandlerc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D22937 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277399 91177308-0d34-0410-b5e6-96231b3b80d8