ES6: Add support for Map/Set forEach

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 3f0f1b86888a2fa4d290d446f2fe9f548f645984..449f5e32db888d716cc563109701e31e55d52379 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1297,6 +1297,18 @@ Handle<JSFunction> Factory::NewFunctionWithoutPrototype(Handle<String> name,
 }
 
 
+Handle<JSObject> Factory::NewIteratorResultObject(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;
+}
+
+
 Handle<ScopeInfo> Factory::NewScopeInfo(int length) {
   Handle<FixedArray> array = NewFixedArray(length, TENURED);
   array->set_map_no_write_barrier(*scope_info_map());
@@ -2255,4 +2267,5 @@ Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
+
 } }  // namespace v8::internal