[ADT] Change PostOrderIterator to use NodeRef. NFC.
Summary: Corresponding LLVM change: D23522 Reviewers: dblaikie Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D23523 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278746 91177308-0d34-0410-b5e6-96231b3b80d8
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