X64: Disabled RSet in 64-bit mode.

src/heap-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 127 matching lines @@
   // - to space is already 25% full.
   return old_address < new_space_.age_mark()
       || (new_space_.Size() + object_size) >= (new_space_.Capacity() >> 2);
 }
 
 
 void Heap::RecordWrite(Address address, int offset) {
   if (new_space_.Contains(address)) return;
   ASSERT(!new_space_.FromSpaceContains(address));
   SLOW_ASSERT(Contains(address + offset));
+#ifndef V8_HOST_ARCH_64_BIT
   Page::SetRSet(address, offset);
+#endif  // V8_HOST_ARCH_64_BIT
 }
 
 
 OldSpace* Heap::TargetSpace(HeapObject* object) {
   InstanceType type = object->map()->instance_type();
   AllocationSpace space = TargetSpaceId(type);
   return (space == OLD_POINTER_SPACE)
       ? old_pointer_space_
       : old_data_space_;
 }
@@ skipping 139 matching lines @@
   allocation_allowed_ = new_state;
   return old;
 }
 
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_