pgsql: isn: Fix debug code

isn: Fix debug code

The ISN_DEBUG code did not compile. Fix that code, don't hide it behind
an #ifdef, make it run when building with asserts, and make it error out
instead of just logging if it fails.

Reviewed-by: David Steele <david@pgmasters.net>

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/9b6cb4650bc6a56114000678c1944afdb95f8333

Modified Files
--------------
contrib/isn/isn.c | 41 +++++++++++++++++++++++------------------
1 file changed, 23 insertions(+), 18 deletions(-)

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