Index: include/llvm/CodeGen/ScheduleDAG.h
===================================================================
--- include/llvm/CodeGen/ScheduleDAG.h
+++ include/llvm/CodeGen/ScheduleDAG.h
@@ -738,6 +738,10 @@
     /// current node \p M.
     void RemovePred(SUnit *M, SUnit *N);
 
+    /// Get a reference to Node2Index, the topological sort
+    /// of the nodes.
+    const std::vector<int> &getNode2Index() { return Node2Index; }
+
     typedef std::vector<int>::iterator iterator;
     typedef std::vector<int>::const_iterator const_iterator;
     iterator begin() { return Index2Node.begin(); }