LibJSGCVerifier: Complain about JS::Handle in members of GC-allocated object

[kalenikaliaksandr]

JS::Handle (strong root) could reach GC-allocated that owns it, creating reference cycle.
Example of leak fix efa305d (#23553)

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[mattco98]

It looks like AsyncFunctionDriverWrapper has a JS::Handle member that is intentional, is there maybe a different mechanism we could use or something? Not sure how I would differentiate that case specifically from any other usage of JS::Handle in a field.

[awesomekling]

Thank you @mattco98 for contributing to close this issue! ⭐

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