Reduce copying of FontCascadeDescription objects by moving them around when possible.
Created attachment 341230 [details] Patch
This is great, thanks!
Comment on attachment 341230 [details] Patch Clearing flags on attachment: 341230 Committed r232175: <https://trac.webkit.org/changeset/232175>
All reviewed patches have been landed. Closing bug.
<rdar://problem/40540743>