[stubs] Port KeyedStoreIC dispatcher to TurboFan

src/code-factory.h

Index: src/code-factory.h
diff --git a/src/code-factory.h b/src/code-factory.h
index 3ece7c0fb16e925a1701b0b4ba109fed346de38a..6be78aea852db74d3605d9368d72f2a274b278b2 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -50,6 +50,7 @@ class V8_EXPORT_PRIVATE CodeFactory final {
   static Callable KeyedStoreIC(Isolate* isolate, LanguageMode mode);
   static Callable KeyedStoreICInOptimizedCode(Isolate* isolate,
                                               LanguageMode mode);
+  static Callable KeyedStoreIC_Megamorphic(Isolate* isolate, LanguageMode mode);
 
   static Callable ResumeGenerator(Isolate* isolate);