Remove TA.p.toSpliced from "change array by copy" methods
Pull request: https://github.com/WebKit/WebKit/pull/2592
<rdar://problem/97345149>
Committed 252664@main (d0e85f861196): <https://commits.webkit.org/252664@main> Reviewed commits have been landed. Closing PR #2592 and removing active labels.