fix long standing bug in isl_mat_inverse_product
fix long standing bug in isl_mat_inverse_product

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