pgsql: Add code to eval_const_expressions() to sup****t

Log Message:
-----------
Add code to eval_const_expressions() to sup****t const-simplification of
CoerceViaIO nodes.  This improves the ability of the planner to deal with
cases where the node input is a constant.  Per bug #4170.

Tags:
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REL8_3_STABLE

Modified Files:
--------------
    pgsql/src/backend/optimizer/util:
        clauses.c (r1.254.2.1 -> r1.254.2.2)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c?r1=1.254.2.1&r2=1.254.2.2)

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