--- a/hotspot/src/share/vm/opto/node.hpp	Sat Mar 14 16:13:48 2015 +0000
+++ b/hotspot/src/share/vm/opto/node.hpp	Tue Mar 17 10:06:31 2015 +0100
@@ -931,7 +931,7 @@
   Node* find_similar(int opc);
 
   // Return the unique control out if only one. Null if none or more than one.
-  Node* unique_ctrl_out();
+  Node* unique_ctrl_out() const;
 
 //----------------- Code Generation