Refactor UnionOfKeys into ElementsAccessor

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 2110 matching lines @@
   // Copy operations.
   MUST_USE_RESULT inline MaybeObject* Copy();
   MUST_USE_RESULT MaybeObject* CopySize(int new_length);
 
   // Add the elements of a JSArray to this FixedArray.
   MUST_USE_RESULT MaybeObject* AddKeysFromJSArray(JSArray* array);
 
   // Compute the union of this and other.
   MUST_USE_RESULT MaybeObject* UnionOfKeys(FixedArray* other);
 
-  // Compute the union of this and other.
-  MUST_USE_RESULT MaybeObject* UnionOfDoubleKeys(
-      FixedDoubleArray* other);
-
   // Copy a sub array from the receiver to dest.
   void CopyTo(int pos, FixedArray* dest, int dest_pos, int len);
 
   // Garbage collection support.
   static int SizeFor(int length) { return kHeaderSize + length * kPointerSize; }
 
   // Code Generation support.
   static int OffsetOfElementAt(int index) { return SizeFor(index); }
 
   // Casting.
@@ skipping 5179 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_