pgsql: Partially revert my patch of 2008-11-12 that installed a limit on

Log Message:
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Partially revert my patch of 2008-11-12 that installed a limit on the number
of AND/OR clause branches that predtest.c would attempt to deal with.  As
noted in bug #4721, that change disabled proof attempts for sizes of problems
that people are actually expecting it to work for.  The original complaint
it was trying to solve was O(N^2) behavior for long IN-lists, so let's try
applying the limit to just ScalarArrayOpExprs rather than everything.
Another case of "foolish consistency" I fear.

Back-patch to 8.2, same as the previous patch was.

Tags:
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REL8_2_STABLE

Modified Files:
--------------
    pgsql/src/backend/optimizer/util:
        predtest.c (r1.10.2.4 -> r1.10.2.5)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/predtest.c?r1=1.10.2.4&r2=1.10.2.5)