Force initialize the runtime module in Module::genLLVMModule. It is required for all non-trivial D modules anyway, so why load it lazily? This fixes run/typeid_83.d (DtoDeclareTypeInfo expects runtime to be initialized)

class C { void foo() {} }

void main()
{
  C c = new C;
  void delegate() dlg = &c.foo;

  assert(dlg);
}