Add some alignment info where LLVM might otherwise be more pessimistic. In particular, %.nest_arg is always aligned even though it's bitcast from i8*. Pointers in vtables are also guaranteed to be stored at aligned addresses.

module nested1;

void func(int i)
{
    (){
        assert(i == 3);
    }();
}

void main()
{
    func(3);
}