Fix non-standard element handling

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 2084 matching lines @@
   static void NormalizeProperties(Handle<JSObject> object,
                                   PropertyNormalizationMode mode,
                                   int expected_additional_properties,
                                   const char* reason);
 
   // Convert and update the elements backing store to be a
   // SeededNumberDictionary dictionary.  Returns the backing after conversion.
   static Handle<SeededNumberDictionary> NormalizeElements(
       Handle<JSObject> object);
 
+  static void RequireSlowElements(Handle<JSObject> object,
+                                  Handle<SeededNumberDictionary> dictionary);
+
   // Transform slow named properties to fast variants.
   static void MigrateSlowToFast(Handle<JSObject> object,
                                 int unused_property_fields, const char* reason);
 
   inline bool IsUnboxedDoubleField(FieldIndex index);
 
   // Access fast-case object properties at index.
   static Handle<Object> FastPropertyAt(Handle<JSObject> object,
                                        Representation representation,
                                        FieldIndex index);
@@ skipping 8678 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_