Commit ed972d5d73ba0592e1ba92426adf2a8f67acf9c9

Behdad Esfahbod 2019-05-09T16:58:28

[iter] Rewrite test functions Notably, add hb_is_source_of(,) and hb_is_sink_of(,) to replace most uses of hb_is_iterator_of(,).