isl_fold.c: remove unused variable
isl_fold.c: remove unused variable

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

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