pgsql: Fix memory arrangement of tsquery after removing stop words.

Log Message:
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Fix memory arrangement  of tsquery after removing stop words. It causes
a unused memory holes in tsquery.

Per report by Richard Huxton <dev@archonet.com>.

It was working well because in fact tsquery->size is not used for any
kind of operation except comparing tsqueries. To prevent requirement
of renew all stored tsquery optimization in CompareTSQ is removed.

Tags:
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REL8_3_STABLE

Modified Files:
--------------
    pgsql/src/backend/tsearch:
        to_tsany.c (r1.8 -> r1.8.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tsearch/to_tsany.c?r1=1.8&r2=1.8.2.1)
    pgsql/src/backend/utils/adt:
        tsquery_op.c (r1.3 -> r1.3.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/tsquery_op.c?r1=1.3&r2=1.3.2.1)