*** old/src/share/vm/opto/optoreg.hpp	Fri May  8 11:59:43 2015
--- new/src/share/vm/opto/optoreg.hpp	Fri May  8 11:59:43 2015

*** 101,110 ****
--- 101,114 ----
    static unsigned int reg2stack( OptoReg::Name r) {
      assert( r >= stack0(), " must be");
      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);
    }