[GENERAL] Heikkki's Visibility Map patch for postgres 8.4 ?

Hi,
Is Heikki's Visibility Map patch included for the Postgresql 8.4 version
http://archives.postgresql.org/pgsql-hackers/2007-11/msg00142.php

If not whats the status of that patch? Im especially interested in the index-only scan mentioned there!!!

Thanks
Sharmila