[GraphTraits] Make nodes_iterator dereference to NodeType*/NodeRef
Currently nodes_iterator may dereference to a NodeType* or a NodeType&. Make them all dereference to NodeType*, which is NodeRef later. Differential Revision: https://reviews.llvm.org/D23704 Differential Revision: https://reviews.llvm.org/D23705 llvm-svn: 279326
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