isl_stream: accept "@" token
isl_stream: accept "@" token

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