isl_schedule.c: setup_lp: extract out count_bound_coefficient_constraints
isl_schedule.c: setup_lp: extract out count_bound_coefficient_constraints

We will be able to reuse it in the next commit.

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

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