add isl_int_mul_si
add isl_int_mul_si

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

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