isl_stream_read_schedule_constraints: do not use default case
isl_stream_read_schedule_constraints: do not use default case

A default case prevents the compiler from detecting that
a new case needs to be added to a switch.

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

inducer/isl-mirror,inducer/isl-mirror,Meinersbur/isl,PollyLabs/isl,inducer/isl-mirror,inducer/isl-mirror,nicolasvasilache/isl,nicolasvasilache/isl,PollyLabs/isl,Meinersbur/isl,inducer/isl-mirror,Meinersbur/isl,nicolasvasilache/isl,nicolasvasilache/isl,Meinersbur/isl,PollyLabs/isl,nicolasvasilache/isl,PollyLabs/isl,PollyLabs/isl