Remove dead GeneralizeFieldRepresentation

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 2218 matching lines @@
  private:
   friend class DictionaryElementsAccessor;
   friend class JSReceiver;
   friend class Object;
 
   static void MigrateFastToFast(Handle<JSObject> object, Handle<Map> new_map);
   static void MigrateFastToSlow(Handle<JSObject> object,
                                 Handle<Map> new_map,
                                 int expected_additional_properties);
 
-  static void GeneralizeFieldRepresentation(Handle<JSObject> object,
-                                            int modify_index,
-                                            Representation new_representation,
-                                            Handle<HeapType> new_field_type);
-
   static void UpdateAllocationSite(Handle<JSObject> object,
                                    ElementsKind to_kind);
 
   // Used from Object::GetProperty().
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithFailedAccessCheck(
       LookupIterator* it);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetElementWithCallback(
       Handle<JSObject> object,
       Handle<Object> receiver,
@@ skipping 8666 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_