Reduce the amount of memory "clobbered" for every process title change, on platforms that need this.  This is done by only writing past the previously stored message, if it was longer.
Reduce the amount of memory "clobbered" for every process title change,
on platforms that need this.  This is done by only writing past the
previously stored message, if it was longer.

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