dillon1000/react

Move useMemoCache outside of hook guards

The hook guards are incompatible with using a forget-runtime. Specifically, 
forget-runtime needs to make a call to `useState()` or some other hook to attach 
data to the fiber, but all the builtin hooks are overridden to disallow calling 
them outside of explicit boundaries. We'd either have to wrap the useMemoCache 
call in a push/pop to allow it to call other hooks, or as in this PR, just move 
it outside the enforcement.