[promises] Move PromiseResolveThenableJob to c++

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 400e15e5c97ddb4fc132baba1b630e7414953787..d231c625a8c035dae2420f45289a8d0fd7e436dc 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -91,7 +91,6 @@ Handle<Box> Factory::NewBox(Handle<Object> value) {
   return result;
 }
 
-
 Handle<PrototypeInfo> Factory::NewPrototypeInfo() {
   Handle<PrototypeInfo> result =
       Handle<PrototypeInfo>::cast(NewStruct(PROTOTYPE_INFO_TYPE));
@@ -889,6 +888,18 @@ Handle<Struct> Factory::NewStruct(InstanceType type) {
       Struct);
 }
 
+Handle<PromiseContainer> Factory::NewPromiseContainer(
+    Handle<Object> promise, Handle<Object> thenable, Handle<JSFunction> then,
+    Handle<JSFunction> resolve, Handle<JSFunction> reject) {
+  Handle<PromiseContainer> result =
+      Handle<PromiseContainer>::cast(NewStruct(PROMISE_CONTAINER_TYPE));
+  result->set_promise(*promise);
+  result->set_thenable(*thenable);
+  result->set_then(*then);
+  result->set_resolve(*resolve);
+  result->set_reject(*reject);
+  return result;
+}
 
 Handle<AliasedArgumentsEntry> Factory::NewAliasedArgumentsEntry(
     int aliased_context_slot) {