Fine-tune inobject slack tracking....

src/objects.h

 // Copyright 2006-2009 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 3519 matching lines @@
   //   size).
   //
   // - A different constructor function sharing the same SharedFunctionInfo is
   //   called in the same context. This could be another closure in the same
   //   context, or the first function could have been disposed.
   //   This is handled the same way as the previous case.
   //
   //  Important: inobject slack tracking is not attempted during the snapshot
   //  creation.
 
-  static const int kGenerousAllocationCount = 16;
+  static const int kGenerousAllocationCount = 8;
 
   // [construction_count]: Counter for constructor calls made during
   // the tracking phase.
   inline int construction_count();
   inline void set_construction_count(int value);
 
   // [initial_map]: initial map of the first function called as a constructor.
   // Saved for the duration of the tracking phase.
   // This is a weak link (GC resets it to undefined_value if no other live
   // object reference this map).
@@ skipping 2168 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_