isl_{map,set}_dim: handle NULL input
isl_{map,set}_dim: handle NULL input

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