Don't convert jump and call targets to code object pointers when (de)serializ...

Don't convert jump and call targets to code object pointers when (de)serializing.

Committed: http://code.google.com/p/v8/source/detail?r=2932

[William Hesse, 2009-09-17 12:32:15]

This is tested on all platforms, with snapshots on and off, and is ready for
review.  The empty BeginCodeIteration functions will disappear once we remove
cooking from the rest of the code, but they are currently needed because the
inherited virtual function contains a cooking assert.

[Erik Corry, 2009-09-18 10:36:36]

I think it's silly to define an empty function in a .cc file when it could just
go in the .h file, but given that this is just a step towards where we want to
go it LGTM.