isl_map_{domain,range}_product: remove possible obvious duplicates
isl_map_{domain,range}_product: remove possible obvious duplicates

If the inputs of isl_map_domain_product or isl_map_range_product
have the same non-disjoint range or domain, then the result may
contain duplicates.  Remove the obvious cases.

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

simbuerg/isl,simbuerg/isl,UBERTC/isl,tobig/isl,PollyLabs/isl,inducer/isl-mirror,jleben/isl,BenzoSM/isl,PollyLabs/isl,evaautomation/isl,UBERTC/isl,tobig/isl,SaberMod/isl-current,jleben/isl,evaautomation/isl,crossbuild/isl,KangDroidSMProject/ISL,abduld/isl,Distrotech/isl,crossbuild/isl,UBERTC/isl,BenzoSM/isl,PollyLabs/isl,Meinersbur/isl,PollyLabs/isl,nicolasvasilache/isl,simbuerg/isl,Distrotech/isl,BenzoSM/isl,jleben/isl,BenzoSM/isl,nicolasvasilache/isl,KangDroidSMProject/ISL,inducer/isl-mirror,tobig/isl,tobig/isl,abduld/isl,SaberMod/isl-current,nicolasvasilache/isl,evaautomation/isl,SaberMod/isl-current,simbuerg/isl,abduld/isl,nicolasvasilache/isl,Meinersbur/isl,crossbuild/isl,Distrotech/isl,Meinersbur/isl,BenzoSM/isl,Meinersbur/isl,Distrotech/isl,SaberMod/isl-current,crossbuild/isl,KangDroidSMProject/ISL,KangDroidSMProject/ISL,KangDroidSMProject/ISL,evaautomation/isl,simbuerg/isl,jleben/isl,inducer/isl-mirror,PollyLabs/isl,abduld/isl,UBERTC/isl,inducer/isl-mirror,jleben/isl,inducer/isl-mirror,nicolasvasilache/isl,Distrotech/isl