--- old/src/share/vm/opto/phaseX.cpp	2012-12-20 20:23:15.198938367 +0100
+++ new/src/share/vm/opto/phaseX.cpp	2012-12-20 20:23:15.035294745 +0100
@@ -75,6 +75,13 @@
   // nh->_sentinel must be in the current node space
 }
 
+void NodeHash::update_with(NodeHash *nh) {
+  debug_only(_table = (Node**)badAddress);   // interact correctly w/ operator=
+  // just copy in all the fields
+  *this = *nh;
+  // nh->_sentinel must be in the current node space
+}
+
 //------------------------------hash_find--------------------------------------
 // Find in hash table
 Node *NodeHash::hash_find( const Node *n ) {