Log Message:
-----------
On AIX, include <sys/atomic_op.h> so that the functions we use for
TAS support are properly declared.
Modified Files:
--------------
pgsql/src/include/storage:
s_lock.h (r1.159 -> r1.160)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/s_lock.h.diff?r1=1.159&r2=1.160)