Update ObjectToString to Harmony-draft algorithm

test/mjsunit/es6/object-tostring.js

Index: test/mjsunit/es6/object-tostring.js
diff --git a/test/mjsunit/es6/object-tostring.js b/test/mjsunit/es6/object-tostring.js
new file mode 100644
index 0000000000000000000000000000000000000000..e609b571c896189bd6be4028e11d662869401819
--- /dev/null
+++ b/test/mjsunit/es6/object-tostring.js
@@ -0,0 +1,35 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-tostring
+
+// TODO: Move duplicated tests into mjsunit/class-of-builtins.js
+var funs = {
+  Object:   [ Object ],
+/*  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]);
+  }
+
+  // Ensure class !== tag
+  var fake = f === "Object" ? [] : {};
+  fake[Symbol.toStringTag] = f;
+  // if tag is "Object", it is not prepended with "~"
+  assertEquals(f === "Object" ? "[object " + f + "]" : "[object ~" + f + "]",
+               Object.prototype.toString.call(fake));
+}