Ensure newly allocated empty Arrays are transitioned to FAST_ELEMENT

src/objects.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1910 matching lines @@
   inline void PrintElements() {
     PrintElements(stdout);
   }
   void PrintElements(FILE* out);
 #endif
 
   void PrintElementsTransition(
       FILE* file, ElementsKind from_kind, FixedArrayBase* from_elements,
       ElementsKind to_kind, FixedArrayBase* to_elements);
 
+  void RecordElementsTransition(
+      ElementsKind from_kind, FixedArrayBase* from_elements,
+      ElementsKind to_kind, FixedArrayBase* to_elements);
+
 #ifdef DEBUG
   // Structure for collecting spill information about JSObjects.
   class SpillInformation {
    public:
     void Clear();
     void Print();
     int number_of_objects_;
     int number_of_objects_with_fast_properties_;
     int number_of_objects_with_fast_elements_;
     int number_of_fast_used_fields_;
@@ skipping 6067 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_