I was testing latest refactor of PerfTools.
When using printOperations() often (but not always) I get 

```
Uncaught TypeError: Cannot read property 'displayName' of undefined
```

in getOperations() on the line:

```
var {displayName, ownerID} = treeSnapshot[instanceID];
```

/**
 * Copyright 2016-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @emails react-core
 */
'use strict';
describe('ReactNativeOperationHistoryDevtool', () => {
  var React;
  var ReactDOM;
  var ReactDOMComponentTree;
  var ReactDOMFeatureFlags;
  var ReactNativeOperationHistoryDevtool;
  beforeEach(() => {
    jest.resetModuleRegistry();
    React = require('React');
    ReactDOM = require('ReactDOM');
    ReactDOMComponentTree = require('ReactDOMComponentTree');
    ReactDOMFeatureFlags = require('ReactDOMFeatureFlags');
    ReactNativeOperationHistoryDevtool = require('ReactNativeOperationHistoryDevtool');
  });
  function assertHistoryMatches(expectedHistory) {