--- old/src/share/vm/interpreter/bytecodes.hpp	2014-11-10 08:14:22.203448955 +0100
+++ new/src/share/vm/interpreter/bytecodes.hpp	2014-11-10 08:14:22.087448961 +0100
@@ -401,8 +401,10 @@
   static bool        is_astore      (Code code)    { return (code == _astore || code == _astore_0 || code == _astore_1
                                                                              || code == _astore_2 || code == _astore_3); }
 
+  static bool        is_const       (Code code)    { return (_aconst_null <= code && code <= _ldc2_w); }
   static bool        is_zero_const  (Code code)    { return (code == _aconst_null || code == _iconst_0
                                                            || code == _fconst_0 || code == _dconst_0); }
+  static bool        is_return      (Code code)    { return (_ireturn <= code && code <= _return); }
   static bool        is_invoke      (Code code)    { return (_invokevirtual <= code && code <= _invokedynamic); }
   static bool        has_receiver   (Code code)    { assert(is_invoke(code), "");  return code == _invokevirtual ||
                                                                                           code == _invokespecial ||