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.

if (__DEV__) {
    if (!isProfiling || currentFlushNesting === 0) {
      currentFlushStartTime = null;
      currentFlushMeasurements = null;
      return;
    }
    var previousStartTime = currentFlushStartTime;
    var previousMeasurements = currentFlushMeasurements || [];