pgsql: Fix bug #4814 (wrong subscript in consistent-function call), and

Log Message:
-----------
Fix bug #4814 (wrong subscript in consistent-function call), and add some
minimal regression test coverage for matchPartialInPendingList().

Modified Files:
--------------
    pgsql/src/backend/access/gin:
        ginget.c (r1.25 -> r1.26)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gin/ginget.c?r1=1.25&r2=1.26)
    pgsql/src/test/regress/expected:
        tsearch.out (r1.15 -> r1.16)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/tsearch.out?r1=1.15&r2=1.16)
    pgsql/src/test/regress/sql:
        tsearch.sql (r1.10 -> r1.11)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/tsearch.sql?r1=1.10&r2=1.11)