[feature]Maybe we can provide createElement in hooks, to cache the created vdom? Or just passing instance into hooks?

[Elaina Cherudim]

Because the hooks are run in beforeMount where the instance object is already created.
We know that createElement is bound to the instance, so may I assume that meanwhile we can createElement and cache the result?

The API might looks like

hooks(props, instance) {
    const h = instance.$createElement;
    const cachedVNode  = useMemo(....); // some custom hook
    return {
        cachedVNode,
    };
},