isl_schedule.c: mark row constructed by compute_split_schedule as non-zero
isl_schedule.c: mark row constructed by compute_split_schedule as non-zero

compute_split_schedule is only called when no zero-distance schedule row
could be found on the entire graph.
We missed this part in ee1ca56 (isl_schedule.c: keep track of parallel loops,
Sun May 29 19:41:55 2011 +0200).

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

tobig/isl,VanirLLVM/toolchain_isl,nicolasvasilache/isl,tobig/isl,cfx-next/toolchain_isl-upstream,crossbuild/isl,KangDroidSMProject/ISL,Distrotech/isl,BobSaget-Mod/libisl,pierrotdelalune/isl,PollyLabs/isl,Meinersbur/isl,VanirLLVM/toolchain_isl,jleben/isl,UBERTC/isl,KangDroidSMProject/ISL,simbuerg/isl,inducer/isl-mirror,crossbuild/isl,UBERTC/isl,BenzoSM/isl,nicolasvasilache/isl,epowers/isl,tobig/isl,PollyLabs/isl,serge-sans-paille/isl,jleben/isl,VanirLLVM/toolchain_isl,evaautomation/isl,serge-sans-paille/isl,serge-sans-paille/isl,Meinersbur/isl,jleben/isl,inducer/isl-mirror,PollyLabs/isl,jleben/isl,KangDroidSMProject/ISL,pierrotdelalune/isl,nicolasvasilache/isl,jleben/isl,inducer/isl-mirror,BobSaget-Mod/libisl,epowers/isl,Distrotech/isl,cfx-next/toolchain_isl-upstream,BobSaget-Mod/libisl,pierrotdelalune/isl,VanirLLVM/toolchain_isl,abduld/isl,PollyLabs/isl,abduld/isl,simbuerg/isl,simbuerg/isl,epowers/isl,Distrotech/isl,serge-sans-paille/isl,evaautomation/isl,abduld/isl,cfx-next/toolchain_isl-upstream,cfx-next/toolchain_isl-upstream,pierrotdelalune/isl,BobSaget-Mod/libisl,epowers/isl,VanirLLVM/toolchain_isl,evaautomation/isl,nicolasvasilache/isl,cfx-next/toolchain_isl-upstream,KangDroidSMProject/ISL,KangDroidSMProject/ISL,BenzoSM/isl,BenzoSM/isl,simbuerg/isl,SaberMod/isl-current,serge-sans-paille/isl,Meinersbur/isl,evaautomation/isl,UBERTC/isl,crossbuild/isl,SaberMod/isl-current,Distrotech/isl,pierrotdelalune/isl,BenzoSM/isl,nicolasvasilache/isl,abduld/isl,SaberMod/isl-current,simbuerg/isl,inducer/isl-mirror,inducer/isl-mirror,UBERTC/isl,PollyLabs/isl,epowers/isl,BobSaget-Mod/libisl,tobig/isl,Meinersbur/isl,Distrotech/isl,SaberMod/isl-current,crossbuild/isl,BenzoSM/isl