[WTF] Use Semaphore and BinarySemaphore instead of dispatch_semaphore_t
Created attachment 339625 [details] Patch
Created attachment 339627 [details] Patch
Created attachment 339631 [details] Patch
Created attachment 339632 [details] Patch
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Comment on attachment 339632 [details] Patch r=me
Committed r236101: <https://trac.webkit.org/changeset/236101>
<rdar://problem/44546999>