hasAttributeWithoutSynchronisation is slightly faster, might help reduce/remove the Speedometer regression.
<rdar://problem/89526227>
Created attachment 453334 [details] [fast-cq] Patch
Committed r290560 (247838@main): <https://commits.webkit.org/247838@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 453334 [details].