Code cleanup for pg_buffercache, from Mark Kirkwood.
Code cleanup for pg_buffercache, from Mark Kirkwood.

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