isl_scheduler.c: count_bound_coefficient_constraints: avoid isl_ctx internals
isl_scheduler.c: count_bound_coefficient_constraints: avoid isl_ctx internals

In particular, call isl_options_get_schedule_max_coefficient
instead of looking into the isl_ctx object.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

UBERTC/isl,UBERTC/isl,tobig/isl,nicolasvasilache/isl,inducer/isl-mirror,tobig/isl,PollyLabs/isl,Meinersbur/isl,PollyLabs/isl,tobig/isl,inducer/isl-mirror,nicolasvasilache/isl,inducer/isl-mirror,BenzoSM/isl,nicolasvasilache/isl,Meinersbur/isl,nicolasvasilache/isl,PollyLabs/isl,inducer/isl-mirror,PollyLabs/isl,tobig/isl,Meinersbur/isl,BenzoSM/isl,UBERTC/isl,inducer/isl-mirror,PollyLabs/isl,UBERTC/isl,BenzoSM/isl,BenzoSM/isl,Meinersbur/isl,nicolasvasilache/isl,BenzoSM/isl