name term: w_ht_t -> unordered_set
name term: w_ht_t -> unordered_set

Summary: very straightforward

Reviewed By: farnz

Differential Revision: D4102152

fbshipit-source-id: d05be3a0d7fd82a15064238eeb6422f2d5f3e8c4

nodakai/watchman,kwlzn/watchman,kwlzn/watchman,wez/watchman,nodakai/watchman,wez/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,kwlzn/watchman,facebook/watchman,facebook/watchman,facebook/watchman,wez/watchman,kwlzn/watchman,facebook/watchman,facebook/watchman,kwlzn/watchman,facebook/watchman,nodakai/watchman,wez/watchman,facebook/watchman,nodakai/watchman,kwlzn/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,nodakai/watchman,wez/watchman,wez/watchman,kwlzn/watchman,wez/watchman