Translator: Limit variable sizes vs uint overflow
<rdar://problem/112414766>
Pull request: https://github.com/apple/WebKit/pull/710
Pull request: https://github.com/WebKit/WebKit/pull/15913
Committed 266146@main (f0359fbb43df): <https://commits.webkit.org/266146@main> Reviewed commits have been landed. Closing PR #15913 and removing active labels.