isl_tab_track_bmap: drop sanity checks in case of empty tab
isl_tab_track_bmap: drop sanity checks in case of empty tab

If tab is empty, then we may not have added all constraints of "bmap"
and so the number of constraints in tab and bmap may be different.

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

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