[promises] Move PromiseResolveThenableJob to c++

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 4db41b5fa324a108b2754d7f9391969879048f16..a44d87759cffc781cf02416d4f012e002d637dd8 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1114,6 +1114,9 @@ class Isolate {
   void ReportPromiseReject(Handle<JSObject> promise, Handle<Object> value,
                            v8::PromiseRejectEvent event);
 
+  void PromiseResolveThenableJob(Handle<PromiseContainer> container,
+                                 MaybeHandle<Object>* result,
+                                 MaybeHandle<Object>* maybe_exception);
   void EnqueueMicrotask(Handle<Object> microtask);
   void RunMicrotasks();
   bool IsRunningMicrotasks() const { return is_running_microtasks_; }