Add missing support for Opteron (__x86_64__).
Add missing support for Opteron (__x86_64__).

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