isl_map_simplify.c: remove unused set_swap_inequality
isl_map_simplify.c: remove unused set_swap_inequality

Its last use was removed in 9f3099a (isl_basic_map_gist: replace by new
version based on tableaus, Wed Mar 18 18:30:39 2009 +0100).

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

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