Fix heap_multi_insert to set t_self field in the caller's tuples.
Fix heap_multi_insert to set t_self field in the caller's tuples.

If tuples were toasted, heap_multi_insert didn't update the ctid on the
original tuples. This caused a failure if there was an after trigger
(including a foreign key), on the table, and a tuple got toasted.

Per off-list report and test case from Ted Phelps

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