message: add distributed dispatch to identity
diff: @@ -54,7 +54,7 @@ template <typename ValueType>
  void Identity<ValueType>::apply_impl(const LinOp* alpha, const LinOp* b,
  const LinOp* beta, LinOp* x) const
  {
  - precision_dispatch_real_complex<ValueType>(
  + precision_dispatch_real_complex_distributed<ValueType>(
  [this](auto dense_alpha, auto dense_b, auto dense_beta, auto dense_x) {
  dense_x->scale(dense_beta);
  dense_x->add_scaled(dense_alpha, dense_b);
  