We purge it [here](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L88-L89) but this code doesn’t run because of the [early exit](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L53-L57).

Need to fix this and add a test case to make sure we don’t regress on it.

ReactPerf.start();
    fn();
    ReactPerf.stop();
    
    ReactPerf.getWasted();
    ReactPerf.getInclusive();
    ReactPerf.getExclusive();
    ReactPerf.getOperations();
    return ReactPerf.getLastMeasurements();
  }
  it('should count no-op update as waste', function() {
    var container = document.createElement('div');
    ReactDOM.render(<App />, container);
    var measurements = measure(() => {
      ReactDOM.render(<App />, container);
    });