isl_union_templ.c: extract out shared isl_union_*_negate_type
isl_union_templ.c: extract out shared isl_union_*_negate_type

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

nicolasvasilache/isl,PollyLabs/isl,nicolasvasilache/isl,inducer/isl-mirror,UBERTC/isl,Distrotech/isl,Meinersbur/isl,PollyLabs/isl,Distrotech/isl,nicolasvasilache/isl,inducer/isl-mirror,Distrotech/isl,UBERTC/isl,Meinersbur/isl,tobig/isl,inducer/isl-mirror,tobig/isl,Distrotech/isl,PollyLabs/isl,BenzoSM/isl,KangDroidSMProject/ISL,nicolasvasilache/isl,PollyLabs/isl,tobig/isl,KangDroidSMProject/ISL,BenzoSM/isl,Meinersbur/isl,nicolasvasilache/isl,PollyLabs/isl,BenzoSM/isl,KangDroidSMProject/ISL,BenzoSM/isl,UBERTC/isl,Meinersbur/isl,Distrotech/isl,inducer/isl-mirror,KangDroidSMProject/ISL,tobig/isl,KangDroidSMProject/ISL,BenzoSM/isl,UBERTC/isl,inducer/isl-mirror