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.
test(
      React.createElement(BoundEventHandler, {initialValue: 'foo'}),
      'DIV',
      'foo'
    );
    attachedListener();
    expect(renderedName).toBe('bar');
  });
  it('should not implicitly bind event handlers', function() {
    test(
      React.createElement(UnboundEventHandler, {initialValue: 'foo'}),
      'DIV',
      'foo'
    );
    expect(attachedListener).toThrow();
  });
  it('renders using forceUpdate even when there is no state', function() {
    test(
      React.createElement(ForceUpdateWithNoState, {initialValue: 'foo'}),
      'DIV',
      'foo'
    );
    attachedListener();
    expect(renderedName).toBe('bar');
  });
  it('will call all the normal life cycle methods', function() {
    lifeCycles = [];
    test(React.createElement(NormalLifeCycles, {value: 'foo'}), 'SPAN', 'foo');
    expect(lifeCycles).toEqual([
      'will-mount',