## Details
Using version 4.0.2 (8/15/2019) I am getting a maximum call stack size exceeded when my app starts up. While my app using this is a little different I have replicated the issue using a fresh create-react-app. I will include the App.js code below.

## Steps to reproduce
1. Create a new app using version 3.0.1 of create-react-app
2. Replace the code in App.js with the code listed below
3. Inspect the console, there should be a stack trace from a maximum call stack exceeded error

## App.js
```
import React from 'react';
import logo from './logo.svg';
import './App.css';

const createDivs = num => {
    const rtn = [];
    for(let i = 0; i < num; i++) {
        const key = `div-${i}`;
        rtn.push(<div className={key} key={key} />)
    }
    return rtn;
}

function App() {
  return (
    <div className="App">
      <header className="App-header">
        <img src={logo} className="App-logo" alt="logo" />
        <p>
          Edit <code>src/App.js</code> and save to reload.
        </p>
        <a
          className="App-link"
          href="https://reactjs.org"
          target="_blank"
          rel="noopener noreferrer"
        >
          Learn React
        </a>
      </header>
      <div>
        {createDivs(15000)}
      </div>
    </div>
  );
}

export default App;
```

## Call Stack
<details>

<summary>backend.js:formatted:2097 Uncaught RangeError: Maximum call stack size exceeded
</summary>

```
    at ge (backend.js:formatted:2097)
    at Ge (backend.js:formatted:2435)
    at Ge (backend.js:formatted:2478)
    at Ge (backend.js:formatted:2478)
    at Ge (backend.js:formatted:2478)
    at Ge (backend.js:formatted:2478)
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    at Ge (backend.js:formatted:2478)
ge @ backend.js:formatted:2097
Ge @ backend.js:formatted:2435
Ge @ backend.js:formatted:2478
Ge @ backend.js:formatted:2478
Ge @ backend.js:formatted:2478
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postMessage (async)
r @ contentScript.js:1
88 @ contentScript.js:1
n @ contentScript.js:1
(anonymous) @ contentScript.js:1
(anonymous) @ contentScript.js:1
Show 170 more frames
```

</details>

This was not an issue in the previous version of react-devtools.
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        }
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    }
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    ) {
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      hasElementUpdatedSinceLastInspected = true;
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    const shouldIncludeInTree = !shouldFilterFiber(nextFiber);
    const isSuspense = nextFiber.tag === SuspenseComponent;
    let shouldResetChildren = false;
     The behavior of timed-out Suspense trees is unique.
     Rather than unmount the timed out content (and possibly lose important state),
     React re-parents this content within a hidden Fragment while the fallback is showing.
     This behavior doesn't need to be observable in the DevTools though.
     It might even result in a bad user experience for e.g. node selection in the Elements panel.
     The easiest fix is to strip out the intermediate Fragment fibers,
     so the Elements panel and Profiler don't need to special case them.
     Suspense components only have a non-null memoizedState if they're timed-out.
    const prevDidTimeout = isSuspense && prevFiber.memoizedState !== null;
    const nextDidTimeOut = isSuspense && nextFiber.memoizedState !== null;
     The logic below is inspired by the code paths in updateSuspenseComponent()
     inside ReactFiberBeginWork in the React source code.