Avoid infinite loop in InvalidateBuffer if we ourselves are holding a pin on the victim buffer.
Avoid infinite loop in InvalidateBuffer if we ourselves are holding
a pin on the victim buffer.

jmcatamney/gpdb,Chibin/gpdb,randomtask1155/gpdb,edespino/gpdb,royc1/gpdb,arcivanov/postgres-xl,arcivanov/postgres-xl,yuanzhao/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,Chibin/gpdb,ahachete/gpdb,tangp3/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,rubikloud/gpdb,kaknikhil/gpdb,foyzur/gpdb,zaksoup/gpdb,Postgres-XL/Postgres-XL,zaksoup/gpdb,rvs/gpdb,janebeckman/gpdb,rubikloud/gpdb,kmjungersen/PostgresXL,adam8157/gpdb,ashwinstar/gpdb,ahachete/gpdb,kmjungersen/PostgresXL,lintzc/gpdb,ovr/postgres-xl,CraigHarris/gpdb,rvs/gpdb,arcivanov/postgres-xl,snaga/postgres-xl,zaksoup/gpdb,postmind-net/postgres-xl,foyzur/gpdb,zaksoup/gpdb,edespino/gpdb,janebeckman/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,chrishajas/gpdb,ashwinstar/gpdb,janebeckman/gpdb,atris/gpdb,tangp3/gpdb,pavanvd/postgres-xl,techdragon/Postgres-XL,foyzur/gpdb,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,kaknikhil/gpdb,rvs/gpdb,arcivanov/postgres-xl,ovr/postgres-xl,adam8157/gpdb,CraigHarris/gpdb,chrishajas/gpdb,cjcjameson/gpdb,lintzc/gpdb,kmjungersen/PostgresXL,randomtask1155/gpdb,royc1/gpdb,postmind-net/postgres-xl,cjcjameson/gpdb,CraigHarris/gpdb,adam8157/gpdb,CraigHarris/gpdb,yazun/postgres-xl,techdragon/Postgres-XL,techdragon/Postgres-XL,tpostgres-projects/tPostgres,tangp3/gpdb,postmind-net/postgres-xl,xuegang/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,rvs/gpdb,arcivanov/postgres-xl,zaksoup/gpdb,lisakowen/gpdb,lpetrov-pivotal/gpdb,50wu/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,oberstet/postgres-xl,Quikling/gpdb,kaknikhil/gpdb,lpetrov-pivotal/gpdb,greenplum-db/gpdb,ahachete/gpdb,Chibin/gpdb,CraigHarris/gpdb,lpetrov-pivotal/gpdb,50wu/gpdb,50wu/gpdb,pavanvd/postgres-xl,rubikloud/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,yuanzhao/gpdb,tangp3/gpdb,0x0FFF/gpdb,chrishajas/gpdb,chrishajas/gpdb,50wu/gpdb,chrishajas/gpdb,ahachete/gpdb,yazun/postgres-xl,tpostgres-projects/tPostgres,50wu/gpdb,adam8157/gpdb,arcivanov/postgres-xl,foyzur/gpdb,oberstet/postgres-xl,lisakowen/gpdb,0x0FFF/gpdb,greenplum-db/gpdb,atris/gpdb,rvs/gpdb,yuanzhao/gpdb,ahachete/gpdb,zeroae/postgres-xl,xuegang/gpdb,adam8157/gpdb,greenplum-db/gpdb,xuegang/gpdb,ovr/postgres-xl,lisakowen/gpdb,postmind-net/postgres-xl,janebeckman/gpdb,Chibin/gpdb,ovr/postgres-xl,xinzweb/gpdb,yuanzhao/gpdb,randomtask1155/gpdb,yuanzhao/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,Chibin/gpdb,tangp3/gpdb,janebeckman/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,Chibin/gpdb,lintzc/gpdb,CraigHarris/gpdb,edespino/gpdb,50wu/gpdb,jmcatamney/gpdb,xuegang/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,Postgres-XL/Postgres-XL,snaga/postgres-xl,jmcatamney/gpdb,kmjungersen/PostgresXL,ashwinstar/gpdb,Chibin/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,Quikling/gpdb,lisakowen/gpdb,janebeckman/gpdb,royc1/gpdb,xinzweb/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,Quikling/gpdb,lisakowen/gpdb,tpostgres-projects/tPostgres,randomtask1155/gpdb,oberstet/postgres-xl,Quikling/gpdb,zeroae/postgres-xl,postmind-net/postgres-xl,randomtask1155/gpdb,lpetrov-pivotal/gpdb,kmjungersen/PostgresXL,edespino/gpdb,xuegang/gpdb,janebeckman/gpdb,xuegang/gpdb,yazun/postgres-xl,yazun/postgres-xl,oberstet/postgres-xl,ahachete/gpdb,tangp3/gpdb,royc1/gpdb,royc1/gpdb,0x0FFF/gpdb,Quikling/gpdb,foyzur/gpdb,edespino/gpdb,edespino/gpdb,atris/gpdb,Postgres-XL/Postgres-XL,CraigHarris/gpdb,kaknikhil/gpdb,lintzc/gpdb,xuegang/gpdb,atris/gpdb,kaknikhil/gpdb,rubikloud/gpdb,zeroae/postgres-xl,ahachete/gpdb,royc1/gpdb,edespino/gpdb,Quikling/gpdb,edespino/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,janebeckman/gpdb,chrishajas/gpdb,0x0FFF/gpdb,randomtask1155/gpdb,ashwinstar/gpdb,lintzc/gpdb,cjcjameson/gpdb,Chibin/gpdb,edespino/gpdb,rubikloud/gpdb,jmcatamney/gpdb,rvs/gpdb,CraigHarris/gpdb,ovr/postgres-xl,lpetrov-pivotal/gpdb,xuegang/gpdb,xinzweb/gpdb,ashwinstar/gpdb,yazun/postgres-xl,techdragon/Postgres-XL,greenplum-db/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,Quikling/gpdb,rvs/gpdb,adam8157/gpdb,lisakowen/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,janebeckman/gpdb,50wu/gpdb,0x0FFF/gpdb,rubikloud/gpdb,Quikling/gpdb,techdragon/Postgres-XL,50wu/gpdb,yuanzhao/gpdb,rubikloud/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,0x0FFF/gpdb,lpetrov-pivotal/gpdb,rvs/gpdb,atris/gpdb,Postgres-XL/Postgres-XL,royc1/gpdb,janebeckman/gpdb,zaksoup/gpdb,zeroae/postgres-xl,chrishajas/gpdb,foyzur/gpdb,adam8157/gpdb,adam8157/gpdb,xuegang/gpdb,lisakowen/gpdb,snaga/postgres-xl,Chibin/gpdb,atris/gpdb,pavanvd/postgres-xl,rvs/gpdb,lintzc/gpdb,zaksoup/gpdb,rvs/gpdb,rubikloud/gpdb,snaga/postgres-xl,greenplum-db/gpdb,atris/gpdb,edespino/gpdb,cjcjameson/gpdb,0x0FFF/gpdb,xinzweb/gpdb,atris/gpdb,Chibin/gpdb,xinzweb/gpdb,tangp3/gpdb,lintzc/gpdb,xinzweb/gpdb,snaga/postgres-xl,ahachete/gpdb,lisakowen/gpdb,foyzur/gpdb,lintzc/gpdb,zaksoup/gpdb,lpetrov-pivotal/gpdb,randomtask1155/gpdb,chrishajas/gpdb,Quikling/gpdb,lintzc/gpdb,royc1/gpdb,oberstet/postgres-xl,randomtask1155/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,tangp3/gpdb,zeroae/postgres-xl,foyzur/gpdb