pub fn set_state_never(&mut self) {
        self.state = PssState::Never;
    }
Declare that this entry will *never* have state. This should be done by
macros that definitively know the structure of a page. This action
is revocable under HSR conditions only.

Note that this will not be preserved in freezing (allowing greater
flexibility of HSR).
packages/perseus/src/state/state_store.rs