merge freestanding map and placeholder array; slowdown of doing a placeholder lookup can be ignored
merge freestanding map and placeholder array; slowdown of doing a placeholder lookup can be ignored

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