isl_schedule.c: extract_node: rename "dim" variable to "space"
isl_schedule.c: extract_node: rename "dim" variable to "space"

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

tobig/isl,evaautomation/isl,SaberMod/isl-current,BenzoSM/isl,BenzoSM/isl,inducer/isl-mirror,crossbuild/isl,tobig/isl,inducer/isl-mirror,simbuerg/isl,PollyLabs/isl,abduld/isl,SaberMod/isl-current,PollyLabs/isl,nicolasvasilache/isl,jleben/isl,abduld/isl,abduld/isl,inducer/isl-mirror,Meinersbur/isl,abduld/isl,PollyLabs/isl,jleben/isl,UBERTC/isl,SaberMod/isl-current,Distrotech/isl,KangDroidSMProject/ISL,jleben/isl,nicolasvasilache/isl,UBERTC/isl,evaautomation/isl,simbuerg/isl,PollyLabs/isl,inducer/isl-mirror,KangDroidSMProject/ISL,BenzoSM/isl,nicolasvasilache/isl,SaberMod/isl-current,simbuerg/isl,Distrotech/isl,KangDroidSMProject/ISL,evaautomation/isl,evaautomation/isl,Meinersbur/isl,simbuerg/isl,Meinersbur/isl,Meinersbur/isl,nicolasvasilache/isl,KangDroidSMProject/ISL,UBERTC/isl,simbuerg/isl,UBERTC/isl,tobig/isl,Distrotech/isl,jleben/isl,Distrotech/isl,Distrotech/isl,BenzoSM/isl,tobig/isl,crossbuild/isl,KangDroidSMProject/ISL,inducer/isl-mirror,BenzoSM/isl,nicolasvasilache/isl,PollyLabs/isl,crossbuild/isl,crossbuild/isl,jleben/isl