Log Message:
-----------
Add code comment about Linux stack randomization and shared memory.
Modified Files:
--------------
pgsql/src/backend/postmaster:
postmaster.c (r1.480 -> r1.481)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c.diff?r1=1.480&r2=1.481)