[JSC] Revive JSC's guard against speculation collection
Created attachment 458649 [details] Patch
Pull request: https://github.com/WebKit/WebKit/pull/449
Committed r293657 (250161@main): <https://commits.webkit.org/250161@main> Reviewed commits have been landed. Closing PR #449 and removing active labels.
<rdar://problem/92587964>