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

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

Per report by Richard Huxton <dev(at)archonet(dot)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:
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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)