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.
import describeComponentFrame from 'shared/describeComponentFrame';
import {ReactDebugCurrentFrame} from 'shared/ReactGlobalSharedState';
import {REACT_FRAGMENT_TYPE} from 'shared/ReactSymbols';
import {
  createMarkupForCustomAttribute,
  createMarkupForProperty,
  createMarkupForRoot,
} from './DOMMarkupOperations';
import {
  Namespaces,
  getIntrinsicNamespace,
  getChildNamespace,
} from '../shared/DOMNamespaces';
import ReactControlledValuePropTypes from '../shared/ReactControlledValuePropTypes';
import assertValidProps from '../shared/assertValidProps';
import dangerousStyleValue from '../shared/dangerousStyleValue';
import escapeTextContentForBrowser from '../shared/escapeTextContentForBrowser';
import isCustomComponent from '../shared/isCustomComponent';
import omittedCloseTags from '../shared/omittedCloseTags';
import warnValidStyle from '../shared/warnValidStyle';
import {validateProperties as validateARIAProperties} from '../shared/ReactDOMInvalidARIAHook';
import {validateProperties as validateInputProperties} from '../shared/ReactDOMNullInputValuePropHook';
import {validateProperties as validateUnknownProperties} from '../shared/ReactDOMUnknownPropertyHook';
type ReactNode = string | number | ReactElement;
type FlatReactChildren = Array<null | ReactNode>;
type toArrayType = (children: mixed) => FlatReactChildren;
var toArray = ((React.Children.toArray: any): toArrayType);
var getStackAddendum = emptyFunction.thatReturns('');
if (__DEV__) {
  var validatePropertiesInDevelopment = function(type, props) {