Add s_lock support for SuperH architecture.
Add s_lock support for SuperH architecture.

After a patch originally submitted by Nobuhiro Iwamatsu, but corrected
(I think) to match our guidelines for safe use of asm fragments.
This should be considered untested ...

yazun/postgres-xl,yazun/postgres-xl,ashwinstar/gpdb,arcivanov/postgres-xl,50wu/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,pavanvd/postgres-xl,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,adam8157/gpdb,ovr/postgres-xl,ashwinstar/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,lisakowen/gpdb,snaga/postgres-xl,50wu/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,jmcatamney/gpdb,postmind-net/postgres-xl,oberstet/postgres-xl,50wu/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,snaga/postgres-xl,ovr/postgres-xl,postmind-net/postgres-xl,adam8157/gpdb,zeroae/postgres-xl,snaga/postgres-xl,xinzweb/gpdb,ashwinstar/gpdb,ovr/postgres-xl,zeroae/postgres-xl,postmind-net/postgres-xl,techdragon/Postgres-XL,zeroae/postgres-xl,50wu/gpdb,adam8157/gpdb,kmjungersen/PostgresXL,arcivanov/postgres-xl,techdragon/Postgres-XL,50wu/gpdb,jmcatamney/gpdb,50wu/gpdb,oberstet/postgres-xl,ovr/postgres-xl,50wu/gpdb,yazun/postgres-xl,oberstet/postgres-xl,snaga/postgres-xl,greenplum-db/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,xinzweb/gpdb,snaga/postgres-xl,yazun/postgres-xl,adam8157/gpdb,lisakowen/gpdb,tpostgres-projects/tPostgres,50wu/gpdb,kmjungersen/PostgresXL,oberstet/postgres-xl,jmcatamney/gpdb,kmjungersen/PostgresXL,pavanvd/postgres-xl,pavanvd/postgres-xl,pavanvd/postgres-xl,greenplum-db/gpdb,arcivanov/postgres-xl,adam8157/gpdb,adam8157/gpdb,postmind-net/postgres-xl,xinzweb/gpdb,tpostgres-projects/tPostgres,adam8157/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,adam8157/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,yazun/postgres-xl,jmcatamney/gpdb,kmjungersen/PostgresXL,Postgres-XL/Postgres-XL,lisakowen/gpdb,lisakowen/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,arcivanov/postgres-xl,xinzweb/gpdb,lisakowen/gpdb,ashwinstar/gpdb,ovr/postgres-xl,postmind-net/postgres-xl,xinzweb/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,xinzweb/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,kmjungersen/PostgresXL,Postgres-XL/Postgres-XL,oberstet/postgres-xl,xinzweb/gpdb,lisakowen/gpdb,zeroae/postgres-xl