Repair possible failure to update hint bits back to disk, per

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 2d46f0e613e4c147643d8b755fb7d4ea7d710311
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-10-13T22:22:03Z
Releases: 7.4.6
Repair possible failure to update hint bits back to disk, per
http://archives.postgresql.org/pgsql-hackers/2004-10/msg00464.php.
I plan a more permanent fix in HEAD, but for the back branches it seems
best to just touch the places that actually have a problem.

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