Fix typo in P4Objects code which sets arith for union fields (#397)
Fix typo in P4Objects code which sets arith for union fields (#397)


p4lang/behavioral-model,hanw/behavioral-model,hanw/behavioral-model,hanw/behavioral-model,p4lang/behavioral-model,hanw/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,hanw/behavioral-model,p4lang/behavioral-model