Dynamically determine optimal instance size....

src/runtime.h

 // Copyright 2010 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 245 matching lines @@
   F(CreateArrayLiteral, 3, 1) \
   F(CreateArrayLiteralShallow, 3, 1) \
   \
   /* Catch context extension objects */ \
   F(CreateCatchExtensionObject, 2, 1) \
   \
   /* Statements */ \
   F(NewClosure, 2, 1) \
   F(NewObject, 1, 1) \
   F(NewObjectFromBound, 2, 1) \
+  F(FinalizeInstanceSize, 1, 1) \
   F(Throw, 1, 1) \
   F(ReThrow, 1, 1) \
   F(ThrowReferenceError, 1, 1) \
   F(StackGuard, 1, 1) \
   F(PromoteScheduledException, 0, 1) \
   \
   /* Contexts */ \
   F(NewContext, 1, 1) \
   F(PushContext, 1, 1) \
   F(PushCatchContext, 1, 1) \
@@ skipping 252 matching lines @@
                                                 int position);
 
   // Helper functions used stubs.
   static void PerformGC(Object* result);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_