diff --git a/include/llvm/Analysis/DataStructure/DSGraph.h b/include/llvm/Analysis/DataStructure/DSGraph.h
index 44b3fac1121..2ade08be6fc 100644
--- a/include/llvm/Analysis/DataStructure/DSGraph.h
+++ b/include/llvm/Analysis/DataStructure/DSGraph.h
@@ -376,6 +376,10 @@ public:
                                  const DSNodeHandle &NH2, NodeMapTy &NodeMap,
                                  bool StrictChecking = true);
 
+  /// computeGlobalGraphMapping - Compute the mapping of nodes in the global
+  /// graph to nodes in this graph.
+  void computeGlobalGraphMapping(NodeMapTy &NodeMap);
+
 
   /// cloneInto - Clone the specified DSGraph into the current graph.  The
   /// translated ScalarMap for the old function is filled into the OldValMap