Reduce use of downcast<>() in SVG code. Use dynamicDowncast<>() instead.
Pull request: https://github.com/WebKit/WebKit/pull/22082
Committed 272374@main (b17ef60d82a2): <https://commits.webkit.org/272374@main> Reviewed commits have been landed. Closing PR #22082 and removing active labels.
<rdar://problem/119950318>