Reduce SVG state in RenderLayer.
Pull request: https://github.com/WebKit/WebKit/pull/19689
Committed 270012@main (0b83dfd6d194): <https://commits.webkit.org/270012@main> Reviewed commits have been landed. Closing PR #19689 and removing active labels.
<rdar://problem/117750293>
Re-opening for pull request https://github.com/WebKit/WebKit/pull/19826
Committed 270088@main (ae3fd4f3cae2): <https://commits.webkit.org/270088@main> Reviewed commits have been landed. Closing PR #19826 and removing active labels.