Update ObjectToString to Harmony-draft algorithm

test/mjsunit/es6/promises.js

Index: test/mjsunit/es6/promises.js
diff --git a/test/mjsunit/es6/promises.js b/test/mjsunit/es6/promises.js
index faf154ee0a5f7c421bfd8e126f972ab2e31d37a7..8b75811176f6bacb213872976cb0fc8ab3e1e264 100644
--- a/test/mjsunit/es6/promises.js
+++ b/test/mjsunit/es6/promises.js
@@ -25,13 +25,21 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony-tostring
 
 // Make sure we don't rely on functions patchable by monkeys.
 var call = Function.prototype.call.call.bind(Function.prototype.call)
 var observe = Object.observe;
-var getOwnPropertyNames = Object.getOwnPropertyNames
-var defineProperty = Object.defineProperty
+var getOwnPropertyNames = Object.getOwnPropertyNames;
+var defineProperty = Object.defineProperty;
+
+
+(function() {
+  // Test before clearing global (fails otherwise)
+  assertEquals("[object Promise]",
+      Object.prototype.toString.call(new Promise(function() {})));
+})();
+
 
 function clear(o) {
   if (o === null || (typeof o !== 'object' && typeof o !== 'function')) return
@@ -58,6 +66,8 @@ for (var i in globals) {
   var name = globals[i]
   if (name in whitelist || name[0] === name[0].toLowerCase()) delete globals[i]
 }
+
+
 for (var i in globals) {
   if (globals[i]) clearProp(this, globals[i])
 }