Log Message:
-----------
Add comments spelling out why it's a good idea to release multiple
partition locks in reverse order.
Modified Files:
--------------
pgsql/src/backend/storage/lmgr:
lock.c (r1.176 -> r1.177)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/lock.c.diff?r1=1.176&r2=1.177)
proc.c (r1.190 -> r1.191)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/proc.c.diff?r1=1.190&r2=1.191)