Log Message:
-----------
Make backends that are reading the pgstats file verify each backend PID
against the PGPROC array.  Anything in the file that isn't in PGPROC
gets rejected as being a stale entry.  This should solve complaints about
stale entries in pg_stat_activity after a BETERM message has been dropped
due to overload.

Modified Files:
--------------
    pgsql/src/backend/postmaster:
        pgstat.c (r1.103 -> r1.104)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgstat.c.diff?r1=1.103&r2=1.104)

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