Fix VarDecls for tuples. Closes #99. I've implemented it this way since it doesn't require any changes in the frontend. However, I think having TypeTuple expressed as LLVM struct types would make much more sense and open the door to tuple lvalues.

module classes11;
extern(C) int printf(char*, ...);

void main()
{
    static class C
    {
        void func()
        {
            printf("Hello world\n");
        }
    }

    scope c = new C;
    c.func();
}