Make heap serialization nondestructive.

src/objects-inl.h

 // Copyright 2006-2008 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 898 matching lines @@
   return MapWord(reinterpret_cast<uintptr_t>(raw));
 }
 
 
 HeapObject* MapWord::ToForwardingAddress() {
   ASSERT(IsForwardingAddress());
   return HeapObject::FromAddress(reinterpret_cast<Address>(value_));
 }
 
 
-bool MapWord::IsSerializationAddress() {
-  return HAS_SMI_TAG(reinterpret_cast<Object*>(value_));
-}
-
-
-MapWord MapWord::FromSerializationAddress(int raw) {
-  // When the map word is being used as a serialization address we Smi-encode
-  // the serialization address (which is always a smallish positive integer).
-  return MapWord(reinterpret_cast<uintptr_t>(Smi::FromInt(raw)));
-}
-
-
-int MapWord::ToSerializationAddress() {
-  // When the map word is being used as a serialization address we treat the
-  // map word as a Smi and get the small integer that it encodes.
-  return reinterpret_cast<Smi*>(value_)->value();
-}
-
-
 bool MapWord::IsMarked() {
   return (value_ & kMarkingMask) == 0;
 }
 
 
 void MapWord::SetMark() {
   value_ &= ~kMarkingMask;
 }
 
 
@@ skipping 2102 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_