isl_tab_basic_set_non_trivial_lexmin: drop explicit conversion to isl_basic_map
isl_tab_basic_set_non_trivial_lexmin: drop explicit conversion to isl_basic_map

And similarly for isl_tab_basic_set_non_neg_lexmin.

In future, the space of an isl_basic_map will be different from that
of an isl_basic_set.  Calling isl_basic_map_from_range may therefore
result in possibly costly changes.

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

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