isl_multi_templ.h: avoid reference to explicit element type
isl_multi_templ.h: avoid reference to explicit element type

This will make it easier to create additional isl_multi_* types.

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

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