Log Message:
-----------
Allow free space map vacuuming to be interrupted.
Modified Files:
--------------
pgsql/src/backend/storage/freespace:
freespace.c (r1.74 -> r1.75)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/freespace/freespace.c?r1=1.74&r2=1.75)