Log Message:
-----------
Make constant-folding produce sane output for COALESCE(NULL,NULL),
that is a plain NULL and not a COALESCE with no inputs.  Fixes crash
reported by Michael Williamson.

Tags:
----
REL7_4_STABLE

Modified Files:
--------------
    pgsql/src/backend/optimizer/util:
        clauses.c (r1.154.2.2 -> r1.154.2.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.154.2.2&r2=1.154.2.3)

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