Revert of [stubs] KeyedLoadIC_Generic: prototype chain lookup support

src/ic/accessor-assembler.cc

Index: src/ic/accessor-assembler.cc
diff --git a/src/ic/accessor-assembler.cc b/src/ic/accessor-assembler.cc
index d60f27ea66fe8137f48a5a8578ccaabb18cc1385..3f07b346490c541b9c95d99e58579ba6bee58592 100644
--- a/src/ic/accessor-assembler.cc
+++ b/src/ic/accessor-assembler.cc
@@ -1403,8 +1403,7 @@
   Variable var_value(this, MachineRepresentation::kTagged);
   Label if_index(this), if_unique_name(this), if_element_hole(this),
       if_oob(this), slow(this), stub_cache_miss(this),
-      if_property_dictionary(this), if_found_on_receiver(this),
-      lookup_prototype_chain(this);
+      if_property_dictionary(this), if_found_on_receiver(this);
 
   Node* receiver = p->receiver;
   GotoIf(TaggedIsSmi(receiver), &slow);
@@ -1529,8 +1528,7 @@
     Variable var_name_index(this, MachineType::PointerRepresentation());
     Label dictionary_found(this, &var_name_index);
     NameDictionaryLookup<NameDictionary>(properties, key, &dictionary_found,
-                                         &var_name_index,
-                                         &lookup_prototype_chain);
+                                         &var_name_index, &slow);
     Bind(&dictionary_found);
     {
       LoadPropertyFromNameDictionary(properties, var_name_index.value(),
@@ -1545,50 +1543,6 @@
                                        p->context, receiver, &slow);
     IncrementCounter(isolate()->counters()->ic_keyed_load_generic_symbol(), 1);
     Return(value);
-  }
-
-  Bind(&lookup_prototype_chain);
-  {
-    Variable var_holder_map(this, MachineRepresentation::kTagged);
-    Variable var_holder_instance_type(this, MachineRepresentation::kWord32);
-    Label return_undefined(this);
-    Variable* merged_variables[] = {&var_holder_map, &var_holder_instance_type};
-    Label loop(this, arraysize(merged_variables), merged_variables);
-
-    var_holder_map.Bind(receiver_map);
-    var_holder_instance_type.Bind(instance_type);
-    Goto(&loop);
-    Bind(&loop);
-    {
-      // Bailout if it can be an integer indexed exotic case.
-      GotoIf(Word32Equal(var_holder_instance_type.value(),
-                         Int32Constant(JS_TYPED_ARRAY_TYPE)),
-             &slow);
-      Node* proto = LoadMapPrototype(var_holder_map.value());
-      GotoIf(WordEqual(proto, NullConstant()), &return_undefined);
-      Node* proto_map = LoadMap(proto);
-      Node* proto_instance_type = LoadMapInstanceType(proto_map);
-      var_holder_map.Bind(proto_map);
-      var_holder_instance_type.Bind(proto_instance_type);
-      Label next_proto(this), return_value(this, &var_value), goto_slow(this);
-      TryGetOwnProperty(p->context, receiver, proto, proto_map,
-                        proto_instance_type, var_unique.value(), &return_value,
-                        &var_value, &next_proto, &goto_slow);
-
-      // This trampoline and the next are required to appease Turbofan's
-      // variable merging.
-      Bind(&next_proto);
-      Goto(&loop);
-
-      Bind(&goto_slow);
-      Goto(&slow);
-
-      Bind(&return_value);
-      Return(var_value.value());
-    }
-
-    Bind(&return_undefined);
-    Return(UndefinedConstant());
   }
 
   Bind(&slow);