isl_multi_*_gist: add missing isl_multi_*_cow
isl_multi_*_gist: add missing isl_multi_*_cow

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

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