Revert r12760 (JSON.stringify).

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 289 matching lines @@
       BasicSerializeArray(value, stack, builder);
     } else {
       BasicSerializeObject(value, stack, builder);
     }
   }
 }
 
 
 function JSONStringify(value, replacer, space) {
   if (%_ArgumentsLength() == 1) {
-    var result = %BasicJSONStringify(value);
-    if (result != 0) return result;
     var builder = new InternalArray();
     BasicJSONSerialize('', value, new InternalArray(), builder);
     if (builder.length == 0) return;
-    result = %_FastAsciiArrayJoin(builder, "");
+    var result = %_FastAsciiArrayJoin(builder, "");
     if (!IS_UNDEFINED(result)) return result;
     return %StringBuilderConcat(builder, builder.length, "");
   }
   if (IS_OBJECT(space)) {
     // Unwrap 'space' if it is wrapped
     if (IS_NUMBER_WRAPPER(space)) {
       space = ToNumber(space);
     } else if (IS_STRING_WRAPPER(space)) {
       space = ToString(space);
     }
@@ skipping 16 matching lines @@
 
 function SetUpJSON() {
   %CheckIsBootstrapping();
   InstallFunctions($JSON, DONT_ENUM, $Array(
     "parse", JSONParse,
     "stringify", JSONStringify
   ));
 }
 
 SetUpJSON();