[stubs] Port KeyedLoadIC_Generic stub to TurboFan

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 018f21d447ea4df27188296ef9777c5f124e2949..df46e4bfdb70636279b3bce5496f63818a1dd14b 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -82,6 +82,10 @@ Callable CodeFactory::KeyedLoadICInOptimizedCode(Isolate* isolate) {
 
 // static
 Callable CodeFactory::KeyedLoadIC_Megamorphic(Isolate* isolate) {
+  if (FLAG_tf_load_ic_stub) {
+    return Callable(isolate->builtins()->KeyedLoadIC_Megamorphic_TF(),
+                    LoadWithVectorDescriptor(isolate));
+  }
   return Callable(isolate->builtins()->KeyedLoadIC_Megamorphic(),
                   LoadWithVectorDescriptor(isolate));
 }