isl_arg_parse: allow options after arguments
isl_arg_parse: allow options after arguments

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

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