pgsql: Fix serious performance bug in new implementation of VACUUM FULL:

Log Message:
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Fix serious performance bug in new implementation of VACUUM FULL:
cluster_rel necessarily builds an all-new toast table, so it's useless to
then go and VACUUM FULL the toast table.

Modified Files:
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pgsql/src/backend/commands:
vacuum.c (r1.405 -> r1.406)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacuum.c?r1=1.405&r2=1.406)