isl_union_map_range_product: only consider pairs of maps with matching domains
isl_union_map_range_product: only consider pairs of maps with matching domains

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

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