Log Message:
-----------
Avoid a memory allocation in the backend startup code, to avoid having to check
whether it failed.  Modelled after catcache.c's usage of DlList, per suggestion
from Tom.

Modified Files:
--------------
    pgsql/src/backend/postmaster:
        postmaster.c (r1.578 -> r1.579)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c?r1=1.578&r2=1.579)

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Next:	From: Tom Lane	Date: 2009-05-04 02:46:37
	Subject: pgsql: Fix missed usage of DLNewElem()
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	Subject: pg-migrator - src: Record all toast entries, not just relkind = 't'