Move elements normalization to the ElementsAccessor

src/elements.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_ELEMENTS_H_
 #define V8_ELEMENTS_H_
 
 #include "src/elements-kind.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 130 matching lines @@
                                 uint32_t start, uint32_t end) = 0;
 
   virtual Handle<JSArray> Splice(Handle<JSArray> receiver,
                                  uint32_t start, uint32_t delete_count,
                                  Arguments* args, uint32_t add_count) = 0;
 
   virtual Handle<Object> Pop(Handle<JSArray> receiver) = 0;
 
   virtual Handle<Object> Shift(Handle<JSArray> receiver) = 0;
 
+  virtual Handle<SeededNumberDictionary> Normalize(Handle<JSObject> object) = 0;
+
  protected:
   friend class LookupIterator;
 
   // Element handlers distinguish between entries and indices when they
   // manipulate elements. Entries refer to elements in terms of their location
   // in the underlying storage's backing store representation, and are between 0
   // and GetCapacity. Indices refer to elements in terms of the value that would
   // be specified in JavaScript to access the element. In most implementations,
   // indices are equivalent to entries. In the NumberDictionary
   // ElementsAccessor, entries are mapped to an index using the KeyAt method on
@@ skipping 24 matching lines @@
                      bool allow_appending = false);
 
 MUST_USE_RESULT MaybeHandle<Object> ArrayConstructInitializeElements(
     Handle<JSArray> array,
     Arguments* args);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ELEMENTS_H_