message: set_coherent() fix
diff: @@ -177,7 +177,7 @@ struct Loop<Mask, enable_if_jit_array_t<Mask>> {
  void set_coherent(bool value) {
  m_coherent = value;
  - if (m_state != 1)
  + if (m_state > 1)
  jit_raise("Loop(\"%s\"): set_coherent() can only be called before "
  "entering the loop!", m_name.get());
  }
  