isl_map_simple_hull: compute affine hull before aligning divs
isl_map_simple_hull: compute affine hull before aligning divs

Computing the affine hull may change the internal representation.
In particular, it may simplify div constraints that are added
during the alignment to constraints that did not appear in the
original set and we do not want to introduce such constraints
in the simple hull.

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