Fix inappropriately-timed memory context switch in autovacuum_do_vac_analyze. This accidentally failed to fail before 8.3, because the context we were switching back to was long-lived anyway; but it sure looks risky as can be now.  Well spotted by Pavan Deolasee.
Fix inappropriately-timed memory context switch in autovacuum_do_vac_analyze.
This accidentally failed to fail before 8.3, because the context we were
switching back to was long-lived anyway; but it sure looks risky as can be
now.  Well spotted by Pavan Deolasee.

arcivanov/postgres-xl,xinzweb/gpdb,zeroae/postgres-xl,kmjungersen/PostgresXL,postmind-net/postgres-xl,ovr/postgres-xl,snaga/postgres-xl,xinzweb/gpdb,snaga/postgres-xl,greenplum-db/gpdb,Chibin/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,edespino/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,xinzweb/gpdb,lisakowen/gpdb,Chibin/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,50wu/gpdb,lisakowen/gpdb,ashwinstar/gpdb,edespino/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,techdragon/Postgres-XL,edespino/gpdb,adam8157/gpdb,yuanzhao/gpdb,oberstet/postgres-xl,Chibin/gpdb,pavanvd/postgres-xl,techdragon/Postgres-XL,yuanzhao/gpdb,snaga/postgres-xl,yuanzhao/gpdb,adam8157/gpdb,kmjungersen/PostgresXL,edespino/gpdb,50wu/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,50wu/gpdb,xinzweb/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,yazun/postgres-xl,lisakowen/gpdb,yuanzhao/gpdb,snaga/postgres-xl,ashwinstar/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,xinzweb/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,yuanzhao/gpdb,ovr/postgres-xl,lisakowen/gpdb,adam8157/gpdb,Chibin/gpdb,greenplum-db/gpdb,lisakowen/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,ovr/postgres-xl,postmind-net/postgres-xl,tpostgres-projects/tPostgres,Postgres-XL/Postgres-XL,oberstet/postgres-xl,oberstet/postgres-xl,oberstet/postgres-xl,ashwinstar/gpdb,tpostgres-projects/tPostgres,jmcatamney/gpdb,arcivanov/postgres-xl,50wu/gpdb,Chibin/gpdb,Chibin/gpdb,postmind-net/postgres-xl,edespino/gpdb,yazun/postgres-xl,yuanzhao/gpdb,arcivanov/postgres-xl,ashwinstar/gpdb,kmjungersen/PostgresXL,kmjungersen/PostgresXL,greenplum-db/gpdb,arcivanov/postgres-xl,50wu/gpdb,edespino/gpdb,ovr/postgres-xl,lisakowen/gpdb,kmjungersen/PostgresXL,50wu/gpdb,postmind-net/postgres-xl,jmcatamney/gpdb,Postgres-XL/Postgres-XL,snaga/postgres-xl,jmcatamney/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,yazun/postgres-xl,ashwinstar/gpdb,Chibin/gpdb,edespino/gpdb,yuanzhao/gpdb,adam8157/gpdb,Chibin/gpdb,50wu/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,edespino/gpdb,arcivanov/postgres-xl,zeroae/postgres-xl,ashwinstar/gpdb,tpostgres-projects/tPostgres,oberstet/postgres-xl,xinzweb/gpdb,ashwinstar/gpdb,50wu/gpdb,yuanzhao/gpdb,yazun/postgres-xl,jmcatamney/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,adam8157/gpdb,jmcatamney/gpdb,yazun/postgres-xl,yuanzhao/gpdb,Chibin/gpdb,pavanvd/postgres-xl,edespino/gpdb,jmcatamney/gpdb,postmind-net/postgres-xl,adam8157/gpdb,Postgres-XL/Postgres-XL,greenplum-db/gpdb,greenplum-db/gpdb,edespino/gpdb,greenplum-db/gpdb,Chibin/gpdb,adam8157/gpdb