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 2013-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.
 *
 * @providesModule DOMChildrenOperations
 */
'use strict';
var DOMLazyTree = require('DOMLazyTree');
var Danger = require('Danger');
var ReactMultiChildUpdateTypes = require('ReactMultiChildUpdateTypes');
var ReactDOMComponentTree = require('ReactDOMComponentTree');
var ReactInstrumentation = require('ReactInstrumentation');
var createMicrosoftUnsafeLocalFunction = require('createMicrosoftUnsafeLocalFunction');
var setInnerHTML = require('setInnerHTML');
var setTextContent = require('setTextContent');
function getNodeAfter(parentNode, node) {