pgsql: Adjust check_for_isn_and_int8_passing_mismatch() so it is called

Log Message:
-----------
Adjust check_for_isn_and_int8_passing_mismatch() so it is called for all
migrations.

Backpatch to 9.0.

Modified Files:
--------------
pgsql/contrib/pg_upgrade:
check.c (r1.13 -> r1.14)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_upgrade/check.c?r1=1.13&r2=1.14)
pg_upgrade.h (r1.15 -> r1.16)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_upgrade/pg_upgrade.h?r1=1.15&r2=1.16)
version_old_8_3.c (r1.7 -> r1.8)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_upgrade/version_old_8_3.c?r1=1.7&r2=1.8)