isl_output.c: can_print_div_expr: do not print div expression in Omega format
isl_output.c: can_print_div_expr: do not print div expression in Omega format

This function is currently never called in Omega format,
but this will change in the next commit.
No div expressions should be printed in Omega format because Omega
does not parse them.

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

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