Update isl to include https://repo.or.cz/isl.git/commit/fc484e004200964f8f18249de1f510393ec924a9 which fixes #180000. The isl update also fixes #34710 which had the same cause but with an empty access domain (#180000 has an empty statement domain). Thus we also revert 163cacb46960be4dd0d8562737bbf0ea97cb14ad which now only adds unnecessary overhead. A regression test has been added to isl which is why we do not add a test in Polly. Fixes: #180000 Thanks @skimo-openhub for the fix and @thapgua for the bugreport.