--- old/src/share/vm/opto/optoreg.hpp	2015-05-08 11:59:43.000000000 -0700
+++ new/src/share/vm/opto/optoreg.hpp	2015-05-08 11:59:43.000000000 -0700
@@ -103,6 +103,10 @@
     return r - stack0();
   }
 
+  static void invalidate(Name n) {
+    vm2opto[n] = Bad;
+  }
+
   // convert a stack slot number into an OptoReg::Name
   static OptoReg::Name stack2reg( int idx) {
     return Name(stack0() + idx);