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.
publicInstance: React$Component<any, any>,
  callerName: string,
) {
  if (__DEV__) {
    var constructor = publicInstance.constructor;
    const componentName =
      (constructor && getComponentName(constructor)) || 'ReactClass';
    const warningKey = `${componentName}.${callerName}`;
    if (didWarnAboutNoopUpdateForComponent[warningKey]) {
      return;
    }
    warning(
      false,
      '%s(...): Can only update a mounting component. ' +
        'This usually means you called %s() outside componentWillMount() on the server. ' +
        'This is a no-op.\n\nPlease check the code for the %s component.',
      callerName,
      callerName,
      componentName,
    );
    didWarnAboutNoopUpdateForComponent[warningKey] = true;
  }
}
function shouldConstruct(Component) {
  return Component.prototype && Component.prototype.isReactComponent;
}
function getNonChildrenInnerMarkup(props) {