**What is the current behavior?**

TypeError: Do not know how to serialize a BigInt which makes it so the react dev tools cannot inspect the component props.

Steps to reproduce

1. Set a component prop to some value of type `BigInt`.
2. Open Chrome DevTools, then React Components view, try inspecting the component
3. There will be an exception [here](https://github.com/facebook/react/blob/b438699d3620bff236282b049204e1221b3689e9/packages/react-devtools-extensions/src/contentScript.js#L28-L38) (with the message above)

You can repro this with the following https://codesandbox.io/s/mystifying-cache-jshv3

Note that you need to repo via Chrome DevTools so that the bridge is active, if you use the codesandbox built-in DevTools the behavior is different.

**What is the expected behavior?**

That bigints are handled in a similar way to how symbols are handled. So that they don't crash when they cross a boundary, i.e. postMessage.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

Latest version, hasn't worked before. That I know. Tested in Chrome and Firefox, although the behavior isn't exactly the same in Firefox as in Chrome, it doesn't appear to work in Firefox either.

I would like to propose a fix for this but I cannot find where in the source this would go. I don't care for editing capabilities and such, I just don't want the dev tools to give up on my just because I have BigInts in my code.

jest.runOnlyPendingTimers();
    });
  }
  beforeEach(() => {
    bridge = global.bridge;
    store = global.store;
    hydrate = require('react-devtools-shared/src/hydration').hydrate;
    meta = require('react-devtools-shared/src/hydration').meta;
    
    
    jest.mock('react', () => jest.requireActual('react-15/dist/react.js'));
    jest.mock('react-dom', () =>
      jest.requireActual('react-dom-15/dist/react-dom.js'),
    );
    React = require('react');
    ReactDOM = require('react-dom');
  });
  it('should inspect the currently selected element', async done => {
    const Example = () => null;
    act(() =>
      ReactDOM.render(<Example a={1} b="abc" />, document.createElement('div')),
    );
    const id = ((store.getElementIDAtIndex(0): any): number);
    const inspectedElement = await read(id);
    expect(inspectedElement).toMatchSnapshot('1: Initial inspection');
    done();
  });
  it('should support simple data types', async done => {
    const Example = () => null;
    act(() =>