message: fix clang 9 build
diff: @@ -196,9 +196,11 @@ State::addFnCall(const string &name, vector<StateValue> &&inputs,
  }
  // TODO: this doesn't need to compare the full memory, just a subset of fields
  - auto [I, inserted]
  + auto call_data_pair
  = fn_call_data[name].try_emplace({ move(inputs), move(ptr_inputs),
  memory, reads_memory, argmemonly });
  + auto &I = call_data_pair.first;
  + bool inserted = call_data_pair.second;
  auto mk_val = [&](const Type &t, const string &name) {
  if (t.isPtrType())
  