Refactor optimized in hydrogen only runtime functions.

src/mirror-debugger.js

 // Copyright 2006-2012 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 520 matching lines @@
  * @constructor
  * @extends ValueMirror
  */
 function NumberMirror(value) {
   %_CallFunction(this, NUMBER_TYPE, value, ValueMirror);
 }
 inherits(NumberMirror, ValueMirror);
 
 
 NumberMirror.prototype.toText = function() {
-  return %NumberToString(this.value_);
+  return %_NumberToString(this.value_);
 };
 
 
 /**
  * Mirror object for string values.
  * @param {string} value The string value reflected by this mirror
  * @constructor
  * @extends ValueMirror
  */
 function StringMirror(value) {
@@ skipping 2132 matching lines @@
   }
   if (!NUMBER_IS_FINITE(value)) {
     if (value > 0) {
       return 'Infinity';
     } else {
       return '-Infinity';
     }
   }
   return value;
 }