Per https://tc39.es/ecma262/#sec-variablestatements-in-catch-blocks.
<rdar://problem/110737558>
Pull request: https://github.com/WebKit/WebKit/pull/15024
Committed 265331@main (a6b9795636a4): <https://commits.webkit.org/265331@main> Reviewed commits have been landed. Closing PR #15024 and removing active labels.