Add Fuzzilli support to jsc. Based on a patch by Samuel Groß and Carl Smith: <https://github.com/googleprojectzero/fuzzilli/blob/main/Targets/JavaScriptCore/Patches/webkit.patch>
<rdar://problem/118531102>
Pull request: https://github.com/WebKit/WebKit/pull/20632
Committed 270923@main (59ee7065d4c9): <https://commits.webkit.org/270923@main> Reviewed commits have been landed. Closing PR #20632 and removing active labels.