It appears that 9aea03f (https://github.com/flutter/flutter/pull/37024) introduced a ~2% regression in the stock_build_iteration microbenchmark: <img width="228" alt="Screen Shot 2019-08-22 at 8 51 51 AM" src="https://user-images.githubusercontent.com/15253456/63530013-8bcdeb00-c4ba-11e9-9541-15c8651e461a.png">
