Add _d_newarrayvT and _d_newarraymvT to create arrays without initialization. Adjust DtoNewDynArray to use DtoArrayInit for initialization of new arrays. Make Type::tvoid->defaultInit() not error.

module bug42;

void main() {
    int i = 2;
    switch (i) {
    case 0:
    case 1:
    default:
    }
}