Add a SYNC instruction to the S_UNLOCK sequence for MIPS.
Add a SYNC instruction to the S_UNLOCK sequence for MIPS.

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