add tests for isl_map_oppose
add tests for isl_map_oppose

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

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