Follow up from https://github.com/facebook/react/pull/11616.

Here's one I found. These two invariants:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L330-L343

are in a function that's behind a DEV block:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L447-L449

I don't think this is intentional, but need to verify.

There may be more. I'll use this issue to track while https://github.com/facebook/react/pull/11616 preserves existing behavior.
oldProps,
    newProps,
    oldState,
    newState,
    newContext,
  ) {
    if (
      oldProps === null ||
      (workInProgress.updateQueue !== null &&
        workInProgress.updateQueue.hasForceUpdate)
    ) {
      
      return true;
    }
    const instance = workInProgress.stateNode;
    const type = workInProgress.type;
    if (typeof instance.shouldComponentUpdate === 'function') {
      startPhaseTimer(workInProgress, 'shouldComponentUpdate');
      const shouldUpdate = instance.shouldComponentUpdate(
        newProps,
        newState,
        newContext,
      );
      stopPhaseTimer();
      
      if (debugRenderPhaseSideEffects) {
        instance.shouldComponentUpdate(newProps, newState, newContext);
      }
      if (__DEV__) {
        warning(