Our clang is not liking the `const uint8_t IsKilled`.
Pull request: https://github.com/WebKit/WebKit/pull/13058
Committed 263276@main (1e12a811a71b): <https://commits.webkit.org/263276@main> Reviewed commits have been landed. Closing PR #13058 and removing active labels.
<rdar://problem/108398124>