Use a wrapper for copying object.

src/heap.cc

 // Copyright 2012 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 4772 matching lines @@
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   }
 
   reinterpret_cast<FixedArray*>(obj)->set_map_no_write_barrier(
       fixed_array_map());
   FixedArray::cast(obj)->set_length(length);
   return obj;
 }
 
 
-MaybeObject* Heap::AllocateEmptyFixedDoubleArray() {
-  int size = FixedDoubleArray::SizeFor(0);
-  Object* result;
-  { MaybeObject* maybe_result =
-        AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE);
-    if (!maybe_result->ToObject(&result)) return maybe_result;
-  }
-  // Initialize the object.
-  reinterpret_cast<FixedDoubleArray*>(result)->set_map_no_write_barrier(
-      fixed_double_array_map());
-  reinterpret_cast<FixedDoubleArray*>(result)->set_length(0);
-  return result;
-}
-
-
 MaybeObject* Heap::AllocateUninitializedFixedDoubleArray(
     int length,
     PretenureFlag pretenure) {
   if (length == 0) return empty_fixed_array();
 
   Object* elements_object;
   MaybeObject* maybe_obj = AllocateRawFixedDoubleArray(length, pretenure);
   if (!maybe_obj->ToObject(&elements_object)) return maybe_obj;
   FixedDoubleArray* elements =
       reinterpret_cast<FixedDoubleArray*>(elements_object);
@@ skipping 2355 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   OS::MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   OS::MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal