Revert code that was backported too eagerly from PostgreSQL 8.4.
Revert code that was backported too eagerly from PostgreSQL 8.4.

Our GIST version doesn't pass the 'recheck' argument to 'consistent'
functions yet. That will come in commit 9b5c8d45f6, as part of the PostgreSQL
merge.

greenplum-db/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,edespino/gpdb,lisakowen/gpdb,lisakowen/gpdb,yuanzhao/gpdb,adam8157/gpdb,50wu/gpdb,xinzweb/gpdb,50wu/gpdb,xinzweb/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,edespino/gpdb,xinzweb/gpdb,50wu/gpdb,lisakowen/gpdb,jmcatamney/gpdb,adam8157/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,xinzweb/gpdb,greenplum-db/gpdb,edespino/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,lisakowen/gpdb,janebeckman/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,Chibin/gpdb,Chibin/gpdb,50wu/gpdb,lisakowen/gpdb,janebeckman/gpdb,Chibin/gpdb,cjcjameson/gpdb,lisakowen/gpdb,Chibin/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,Chibin/gpdb,xinzweb/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,xinzweb/gpdb,cjcjameson/gpdb,adam8157/gpdb,Chibin/gpdb,cjcjameson/gpdb,50wu/gpdb,janebeckman/gpdb,adam8157/gpdb,janebeckman/gpdb,edespino/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,edespino/gpdb,50wu/gpdb,adam8157/gpdb,janebeckman/gpdb,Chibin/gpdb,janebeckman/gpdb,Chibin/gpdb,janebeckman/gpdb,janebeckman/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,Chibin/gpdb,edespino/gpdb,jmcatamney/gpdb,edespino/gpdb,janebeckman/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,Chibin/gpdb,50wu/gpdb,adam8157/gpdb,ashwinstar/gpdb,50wu/gpdb,xinzweb/gpdb,ashwinstar/gpdb,edespino/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,janebeckman/gpdb,xinzweb/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,lisakowen/gpdb,edespino/gpdb,adam8157/gpdb,lisakowen/gpdb,edespino/gpdb,adam8157/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,yuanzhao/gpdb