Rewrite of VisitCountOperation that should speed it up

src/runtime.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 179 matching lines @@
   return %NumberDiv(%ToNumber(this), %ToNumber(x));
 }
 
 
 // ECMA-262, section 11.5.3, page 49.
 function MOD(x) {
   return %NumberMod(%ToNumber(this), %ToNumber(x));
 }
 
 
-// ECMA-262, section 11.4.4, page 47.
-function INC() {
-  return %NumberAdd(%ToNumber(this), 1);
-}
-
-
-// ECMA-262, section 11.4.5, page 48.
-function DEC() {
-  return %NumberSub(%ToNumber(this), 1);
-}
-
-
 
 /* -------------------------------------------
    - - -   B i t   o p e r a t i o n s   - - -
    -------------------------------------------
 */
 
 // ECMA-262, section 11.10, page 57.
 function BIT_OR(x) {
   return %NumberOr(%ToNumber(this), %ToNumber(x));
 }
@@ skipping 306 matching lines @@
   throw %MakeTypeError('cannot_convert_to_primitive', []);
 }
 
 
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essiential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));