Add remaining @@toStringTag symbols to builtins

test/mjsunit/es6/array-iterator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony-tostring
 
 
 var NONE = 0;
 var READ_ONLY = 1;
 var DONT_ENUM = 2;
 var DONT_DELETE = 4;
 
 
 function assertHasOwnProperty(object, name, attrs) {
   assertTrue(object.hasOwnProperty(name));
@@ skipping 112 matching lines @@
 
   assertEquals('Array Iterator', %_ClassOf(array[Symbol.iterator]()));
   assertEquals('Array Iterator', %_ClassOf(array.keys()));
   assertEquals('Array Iterator', %_ClassOf(array.entries()));
 
   assertFalse(ArrayIteratorPrototype.hasOwnProperty('constructor'));
   assertArrayEquals(['next'],
       Object.getOwnPropertyNames(ArrayIteratorPrototype));
   assertHasOwnProperty(ArrayIteratorPrototype, 'next', DONT_ENUM);
   assertHasOwnProperty(ArrayIteratorPrototype, Symbol.iterator, DONT_ENUM);
+
+  assertEquals("[object Array Iterator]",
+      Object.prototype.toString.call(iterator));
+  assertEquals("Array Iterator", ArrayIteratorPrototype[Symbol.toStringTag]);
+  var desc = Object.getOwnPropertyDescriptor(
+      ArrayIteratorPrototype, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.writable);
+  assertEquals("Array Iterator", desc.value);
 }
 TestArrayIteratorPrototype();
 
 
 function TestForArrayValues() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
   var i = 0;
   for (var value of array[Symbol.iterator]()) {
     buffer[i++] = value;
@@ skipping 66 matching lines @@
 function TestNonOwnSlots() {
   var array = [0];
   var iterator = array[Symbol.iterator]();
   var object = {__proto__: iterator};
 
   assertThrows(function() {
     object.next();
   }, TypeError);
 }
 TestNonOwnSlots();