message: Sort control edges on input considering src node
  Else the order of control edges could change from run to run. The order of the control edges shouldn't matter, but providing consistent input order for given graph makes changes easier to identify.
diff: @@ -1817,6 +1817,8 @@ Status ImporterBase::ConvertNode(const Node& node) {
  absl::c_stable_sort(in_edges, [](const Edge* e1, const Edge* e2) {
  if (e1->IsControlEdge() && !e2->IsControlEdge()) return false;
  if (!e1->IsControlEdge() && e2->IsControlEdge()) return true;
  + if (e1->IsControlEdge() && e2->IsControlEdge())
  + return e1->src()->id() < e2->src()->id();
  return e1->dst_input() < e2->dst_input();
  });
  