Fix compile error on gcc-4.5 bug 963

src/spaces.cc

 // 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 899 matching lines @@
       reinterpret_cast<AtomicWord*>(table[index]);
   if (more_fine_grained_table == kUnusedChunkTableEntry) {
     if (create_as_needed == kDontCreateTables) return NULL;
     int words_needed = 1 << kChunkTableBitsPerLevel;
     if (bit_position == kChunkTableBitsPerLevel + kChunkSizeLog2) {
       words_needed =
           (1 << kChunkTableBitsPerLevel) * kChunkTableFineGrainedWordsPerEntry;
     }
     more_fine_grained_table = new AtomicWord[words_needed];
     for (int i = 0; i < words_needed; i++) {
-      more_fine_grained_table[i] = NULL;
+      more_fine_grained_table[i] = kUnusedChunkTableEntry;
     }
     Release_Store(&table[index],
                   reinterpret_cast<AtomicWord>(more_fine_grained_table));
   }
   return AllocatedChunksFinder(
       more_fine_grained_table,
       more_fine_grained_address,
       bit_position - kChunkTableBitsPerLevel,
       create_as_needed);
 }
@@ skipping 2314 matching lines @@
   for (HeapObject* obj = obj_it.next(); obj != NULL; obj = obj_it.next()) {
     if (obj->IsCode()) {
       Code* code = Code::cast(obj);
       code_kind_statistics[code->kind()] += code->Size();
     }
   }
 }
 #endif  // DEBUG
 
 } }  // namespace v8::internal