[es6] Introduce a dedicated JSIteratorResult type.

src/factory.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 1662 matching lines @@
 
 
 Handle<JSSetIterator> Factory::NewJSSetIterator() {
   Handle<Map> map(isolate()->native_context()->set_iterator_map());
   CALL_HEAP_FUNCTION(isolate(),
                      isolate()->heap()->AllocateJSObjectFromMap(*map),
                      JSSetIterator);
 }
 
 
+Handle<JSIteratorResult> Factory::NewJSIteratorResult(Handle<Object> value,
+                                                      Handle<Object> done) {
+  Handle<JSIteratorResult> result = Handle<JSIteratorResult>::cast(
+      NewJSObjectFromMap(isolate()->iterator_result_map()));
+  result->set_value(*value);
+  result->set_done(*done);
+  return result;
+}
+
+
 namespace {
 
 ElementsKind GetExternalArrayElementsKind(ExternalArrayType type) {
   switch (type) {
 #define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
   case kExternal##Type##Array:                          \
     return TYPE##_ELEMENTS;
     TYPED_ARRAYS(TYPED_ARRAY_CASE)
   }
   UNREACHABLE();
@@ skipping 656 matching lines @@
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 }  // namespace internal
 }  // namespace v8