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99df257910
DSNodes, unlike other GraphTraits nodes, can have null outgoing edges, and df_iterator doesn't take this into consideration. As a workaround, the successor iterator now handles null nodes and 'indicates' that null has no successors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12025 91177308-0d34-0410-b5e6-96231b3b80d8