Set indcheckxmin true when REINDEX fixes an invalid or not-ready index.
Set indcheckxmin true when REINDEX fixes an invalid or not-ready index.

Per comment from Greg Stark, it's less clear that HOT chains don't conflict
with the index than it would be for a valid index.  So, let's preserve the
former behavior that indcheckxmin does get set when there are
potentially-broken HOT chains in this case.  This change does not cause any
pg_index update that wouldn't have happened anyway, so we're not
re-introducing the previous bug with pg_index updates, and surely the case
is not significant from a performance standpoint; so let's be as
conservative as possible.

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