Clean up some suspicious code. There's no guarantee a constant of integer type is a ConstantInt, so it's not safe to just cast<> these to ConstantInt. (It could be a constant expression, for example) The code is shorter this way too :).

module bug18;

struct S {
    int[9] i;
}

void main()
{
    int[9] i;
    auto s = S(i);
}