message: let DelSuper pass respect keep rule
diff: @@ -278,6 +278,9 @@ class DelSuper {
  void run(bool do_delete, PassManager& mgr) {
  walk::methods(m_scope, [&](DexMethod* meth) {
  m_num_methods++;
  + if (root(meth)) {
  + return;
  + }
  auto invoked_meth = get_trivial_return_invoke_super(meth);
  if (invoked_meth) {
  TRACE(SUPER, 5, "Found trivial return invoke-super: %s", SHOW(meth));
  