Log Message:
-----------
Reduce the size of memory allocations by lazy vacuum when processing a small
table, by allocating just enough for a hardcoded number of dead tuples per
page.  The current estimate is 200 dead tuples per page.

Per reports from Jeff Amiel, Erik Jones and Marko Kreen, and subsequent
discussion.
CVS: ----------------------------------------------------------------------
CVS: Enter Log.  Lines beginning with `CVS:' are removed automatically
CVS: 
CVS: Committing in .
CVS: 
CVS: Modified Files:
CVS:    commands/vacuumlazy.c 
CVS: ----------------------------------------------------------------------

Tags:
----
REL8_2_STABLE

Modified Files:
--------------
    pgsql/src/backend/commands:
        vacuumlazy.c (r1.81.2.3 -> r1.81.2.4)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacuumlazy.c?r1=1.81.2.3&r2=1.81.2.4)

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