fix P4WriteContext::isWrite to understand about array and member accesses
fix P4WriteContext::isWrite to understand about array and member accesses

mbudiu-vmw/p4c-clone,mbudiu-vmw/p4c-clone,p4lang/p4c,p4lang/p4c,hanw/p4c,hanw/p4c,p4lang/p4c,hanw/p4c,hanw/p4c,p4lang/p4c,mbudiu-vmw/p4c-clone,mbudiu-vmw/p4c-clone,p4lang/p4c