- Remember the fact that an object has been added to the

runtime/vm/freelist.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/freelist.h"
 
 #include <map>
 #include <utility>
 
 #include "vm/bit_set.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
 
 namespace dart {
 
 
 FreeListElement* FreeListElement::AsElement(uword addr, intptr_t size) {
   ASSERT(size >= kObjectAlignment);
   ASSERT(Utils::IsAligned(size, kObjectAlignment));
 
   FreeListElement* result = reinterpret_cast<FreeListElement*>(addr);
 
   uword tags = 0;
-  tags = RawObject::FreeBit::update(true, tags);
+  // tags = RawObject::FreeBit::update(true, tags);
   tags = RawObject::SizeTag::update(size, tags);
   tags = RawObject::ClassIdTag::update(kFreeListElement, tags);
 
   result->tags_ = tags;
   if (size > RawObject::SizeTag::kMaxSizeTag) {
     *result->SizeAddress() = size;
   }
   result->set_next(NULL);
 
   return result;
@@ skipping 183 matching lines @@
   intptr_t remainder_size = element->Size() - size;
   if (remainder_size == 0) return;
 
   element = FreeListElement::AsElement(reinterpret_cast<uword>(element) + size,
                                        remainder_size);
   intptr_t remainder_index = IndexForSize(remainder_size);
   EnqueueElement(element, remainder_index);
 }
 
 }  // namespace dart