Implement the `array.new_canon_fixed` operation from https://github.com/WebAssembly/gc/blob/main/proposals/gc/MVP.md
<rdar://problem/105800747>
Pull request: https://github.com/WebKit/WebKit/pull/10548
Committed 262358@main (3f3a54d2690d): <https://commits.webkit.org/262358@main> Reviewed commits have been landed. Closing PR #10548 and removing active labels.