This is the same problem as bug 224416 but also happening on platforms that use i965.
Created attachment 430469 [details] [fast-cq] Patch
Committed r278408 (238433@main): <https://commits.webkit.org/238433@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 430469 [details].
<rdar://problem/78816324>