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.
});
  it('renders a simple stateless component with prop', function() {
    test(React.createElement(SimpleStateless, {bar: 'foo'}), 'DIV', 'foo');
    test(React.createElement(SimpleStateless, {bar: 'bar'}), 'DIV', 'bar');
  });
  it('renders based on state using initial values in this.props', function() {
    test(
      React.createElement(InitialState, {initialValue: 'foo'}),
      'SPAN',
      'foo'
    );
  });
  it('renders based on state using props in the constructor', function() {
    var instance = test(
      React.createElement(StateBasedOnProps, {initialValue: 'foo'}),
      'DIV',
      'foo'
    );
    instance.changeState();
    test(React.createElement(StateBasedOnProps), 'SPAN', 'bar');
  });
  it('renders based on context in the constructor', function() {
    test(React.createElement(ProvideChildContextTypes), 'SPAN', 'foo');
  });
  it('renders only once when setting state in componentWillMount', function() {
    renderCount = 0;
    test(React.createElement(RenderOnce, {initialValue: 'foo'}), 'SPAN', 'bar');
    expect(renderCount).toBe(1);
  });
  it('should throw with non-object in the initial state property', function() {