WIP [esnext] implement async iteration proposal

src/code-factory.h

Index: src/code-factory.h
diff --git a/src/code-factory.h b/src/code-factory.h
index 2500ebd27435b24931f4ffc8944254943630394c..c3687ec7720287000e1f334764464bbd46b3d428 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -59,6 +59,7 @@ class V8_EXPORT_PRIVATE CodeFactory final {
   static Callable KeyedStoreIC_Megamorphic(Isolate* isolate, LanguageMode mode);
 
   static Callable ResumeGenerator(Isolate* isolate);
+  static Callable ResumeAwaitedGenerator(Isolate* isolate);
 
   static Callable CompareIC(Isolate* isolate, Token::Value op);
   static Callable CompareNilIC(Isolate* isolate, NilValue nil_value);