Update ObjectToString to Harmony-draft algorithm

test/mjsunit/es6/generators-objects.js

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-// Flags: --harmony-scoping --allow-natives-syntax
+// Flags: --harmony-scoping --allow-natives-syntax --harmony-tostring
 
 // Test instantations of generators.
 
 // Generators shouldn't allocate stack slots.  This test will abort in debug
 // mode if generators have stack slots.
 function TestContextAllocation() {
   function* g1(a, b, c) { yield 1; return [a, b, c]; }
   function* g2() { yield 1; return arguments; }
   function* g3() { yield 1; return this; }
   function* g4() { var x = 10; yield 1; return x; }
@@ skipping 20 matching lines @@
   assertEquals("[object Generator]", String(iter));
   assertEquals([], Object.getOwnPropertyNames(iter));
   assertTrue(iter !== g());
 
   // g() is the same as new g().
   iter = new g();
   assertSame(g.prototype, Object.getPrototypeOf(iter));
   assertTrue(iter instanceof g);
   assertEquals("Generator", %_ClassOf(iter));
   assertEquals("[object Generator]", String(iter));
+  assertEquals("[object Generator]", Object.prototype.toString.call(iter));
   assertEquals([], Object.getOwnPropertyNames(iter));
   assertTrue(iter !== new g());
 }
 TestGeneratorObject();
 
 
 // Test the methods of generator objects.
 function TestGeneratorObjectMethods() {
   function* g() { yield 1; }
   var iter = g();
 
   function TestNonGenerator(non_generator) {
     assertThrows(function() { iter.next.call(non_generator); }, TypeError);
     assertThrows(function() { iter.next.call(non_generator, 1); }, TypeError);
     assertThrows(function() { iter.throw.call(non_generator, 1); }, TypeError);
     assertThrows(function() { iter.close.call(non_generator); }, TypeError);
   }
 
   TestNonGenerator(1);
   TestNonGenerator({});
   TestNonGenerator(function(){});
   TestNonGenerator(g);
   TestNonGenerator(g.prototype);
 }
 TestGeneratorObjectMethods();