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 nested4;

void func(void delegate() dg) {
  auto v = (){
    dg();
  };
}

void main()
{
    func({});
}