Avoid heap-allocating ImportanceAssertion since this is just a wrapper around a mach_port.
Created attachment 443012 [details] Patch
Created attachment 443013 [details] Patch
Committed r285138 (243777@main): <https://commits.webkit.org/243777@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 443013 [details].
<rdar://problem/84903221>