add warmup code to avoid the test failing due to constants not yet being swapped in
add warmup code to avoid the test failing due to constants not yet being swapped in

yannick/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,devnexen/h2o,cwyang/h2o,h2o/h2o,h2o/h2o,cwyang/h2o,devnexen/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,yannick/h2o,devnexen/h2o,cwyang/h2o,yannick/h2o,devnexen/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,yannick/h2o,yannick/h2o,yannick/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,cwyang/h2o,h2o/h2o,cwyang/h2o,yannick/h2o