Update ObjectToString to Harmony-draft algorithm

test/mjsunit/class-of-builtins.js

 // Copyright 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 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // The [[Class]] property of (instances of) builtin functions must be
 // correctly set.
 var funs = {
-  Object:   [ Object ],
+  /*Object:   [ Object ],*/

[rossberg, 2014/10/17 11:19:30]

Why is this commented out?

   Function: [ Function ],
   Array:    [ Array ],
   String:   [ String ],
   Boolean:  [ Boolean ],
   Number:   [ Number ],
   Date:     [ Date ],
   RegExp:   [ RegExp ],
   Error:    [ Error, TypeError, RangeError, SyntaxError, ReferenceError, EvalError, URIError ]
 }
 for (f in funs) {
   for (i in funs[f]) {
     assertEquals("[object " + f + "]",
                  Object.prototype.toString.call(new funs[f][i]),
                  funs[f][i]);
     assertEquals("[object Function]",
                  Object.prototype.toString.call(funs[f][i]),
                  funs[f][i]);
+
+    var fake = f === 'Object' ? [] : {};
+    fake[Symbol.toStringTag] = '' + f;
+    assertEquals("[object ~" + f + "]",
+                 Object.prototype.toString.call(fake));
   }
 }