[esnext] handle elements in FastObjectValuesOrEntries()

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 76 matching lines @@
 
   inline void CollectElementIndices(Handle<JSObject> object,
                                     KeyAccumulator* keys,
                                     uint32_t range = kMaxUInt32,
                                     PropertyFilter filter = ALL_PROPERTIES,
                                     uint32_t offset = 0) {
     CollectElementIndices(object, handle(object->elements()), keys, range,
                           filter, offset);
   }
 
+  virtual Maybe<bool> CollectValuesOrEntries(
+      Isolate* isolate, Handle<JSObject> object,
+      Handle<FixedArray> values_or_entries, bool get_entries, int* nof_items,
+      PropertyFilter filter = ALL_PROPERTIES);
+
   //
   virtual Handle<FixedArray> PrependElementIndices(
       Handle<JSObject> object, Handle<FixedArrayBase> backing_store,
       Handle<FixedArray> keys, GetKeysConversion convert,
       PropertyFilter filter = ALL_PROPERTIES) = 0;
 
   inline Handle<FixedArray> PrependElementIndices(
       Handle<JSObject> object, Handle<FixedArray> keys,
       GetKeysConversion convert, PropertyFilter filter = ALL_PROPERTIES) {
     return PrependElementIndices(object, handle(object->elements()), keys,
@@ skipping 78 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_