isl_map_project_out: properly handle named or nested spaces
isl_map_project_out: properly handle named or nested spaces

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

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