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];
```

it('should remove when setting custom attr to null', function() {
      DOMPropertyOperations.setValueForProperty(
        stubNode,
        'data-foo',
        'bar'
      );
      expect(stubNode.hasAttribute('data-foo')).toBe(true);
      DOMPropertyOperations.setValueForProperty(
        stubNode,
        'data-foo',
        null
      );
      expect(stubNode.hasAttribute('data-foo')).toBe(false);
    });
    it('should use mutation method where applicable', function() {
      var foobarSetter = jest.fn();
      
      DOMProperty.injection.injectDOMPropertyConfig({
        Properties: {foobar: null},
        DOMMutationMethods: {
          foobar: foobarSetter,
        },
      });
      DOMPropertyOperations.setValueForProperty(
        stubNode,
        'foobar',
        'cows say moo'
      );
      expect(foobarSetter.mock.calls.length).toBe(1);
      expect(foobarSetter.mock.calls[0][0]).toBe(stubNode);