Rewrite pg_freespacemap to match the new FSM implementation. I missed these

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: d3de08a008252aba78ce9e5ca8c83d34dbbc0418
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2008-09-30T11:17:07Z
Releases: 8.4.0
Rewrite pg_freespacemap to match the new FSM implementation. I missed these
changes from the main FSM commit for some reason.

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