Cosmetic: Add macros for NaN, undefined and Infinity to native js code.

src/json.js

 // Copyright 2009 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 163 matching lines @@
       return JSON_NUMBER_TO_STRING(value);
     } else if (IS_STRING_WRAPPER(value)) {
       return %QuoteJSONString(ToString(value));
     } else if (IS_BOOLEAN_WRAPPER(value)) {
       return %_ValueOf(value) ? "true" : "false";
     } else {
       return SerializeObject(value, replacer, stack, indent, gap);
     }
   }
   // Undefined or a callable object.
-  return void 0;
+  return UNDEFINED;
 }
 
 
 function JSONStringify(value, replacer, space) {
   if (%_ArgumentsLength() == 1) {
     return %BasicJSONStringify(value);
   }
   if (IS_OBJECT(space)) {
     // Unwrap 'space' if it is wrapped
     if (IS_NUMBER_WRAPPER(space)) {
@@ skipping 34 matching lines @@
 SetUpJSON();
 
 
 // -------------------------------------------------------------------
 // JSON Builtins
 
 function JSONSerializeAdapter(key, object) {
   var holder = {};
   holder[key] = object;
   // No need to pass the actual holder since there is no replacer function.
-  return JSONSerialize(key, holder, void 0, new InternalArray(), "", "");
+  return JSONSerialize(key, holder, UNDEFINED, new InternalArray(), "", "");
 }