[libpas] Use os_unfair_lock instead of spinlock
Created attachment 450939 [details] Patch
Comment on attachment 450939 [details] Patch r=me
This is historically failing so much. https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Frendering%2Freplaced-elements%2Fattributes-for-embedded-content-and-images%2Fimg-aspect-ratio-lazy.html
Committed r289145 (?): <https://commits.webkit.org/r289145>
<rdar://problem/88516809>