isl_scheduler.c: intra_coefficients: use isl_map_to_basic_set_try_get
isl_scheduler.c: intra_coefficients: use isl_map_to_basic_set_try_get

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

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