ES6: Add support for Map.prototype.forEach and Set.prototype.forEach

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index fc49e32537ebec9a4799012bc10b4b7ccbeffc72..6eb99f7aeaa88e7d7122a4cc494596df108a500d 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1996,4 +1996,16 @@ Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
+
+Handle<JSObject> Factory::CreateIteratorResultObject(Handle<Object> value,
+                                                     bool done) {
+  Handle<Map> map(isolate()->native_context()->iterator_result_map());
+  Handle<JSObject> result = NewJSObjectFromMap(map, NOT_TENURED, false);
+  result->InObjectPropertyAtPut(
+      JSGeneratorObject::kResultValuePropertyIndex, *value);
+  result->InObjectPropertyAtPut(
+      JSGeneratorObject::kResultDonePropertyIndex, *ToBoolean(done));
+  return result;
+}
+
 } }  // namespace v8::internal