isl_union_pw_aff_floor: use isl_union_pw_aff_transform_inplace
isl_union_pw_aff_floor: use isl_union_pw_aff_transform_inplace

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

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