isl_stream_read_map: accept alternative [i][j] tuple syntax
isl_stream_read_map: accept alternative [i][j] tuple syntax

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

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