Apparently, C++11 feature that guarantees that static initialisation be thread-safe is disabled in webkit. Making the change in bug 225910 wrong. Should do initialisation in a different manner
<rdar://problem/80557419>
Created attachment 433486 [details] Patch
Comment on attachment 433486 [details] Patch r=me
Committed r279905 (239654@main): <https://commits.webkit.org/239654@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433486 [details].