Re: [whatwg/dom] Add AbortSignal.any() (PR #1152)

Well, although we don't always do a good job at this, we do need to describe relationships between objects in a way that allows GC to eventually succeed. And I don't think we should accept "agent lifetime" as a way out, although sometimes that is acceptable.

I hadn't looked at the GC section here yet, I was hoping @smaug---- could take a look at that. But now that I have:

* Strong references are implied so don't need to be stated.
* That something is a weak reference should be mentioned as part of the definition, not in a separate section.
* The GC section should mainly state when something can be GC'd or ideally what prevents GC when GC would otherwise be possible. https://xhr.spec.whatwg.org/#garbage-collection is an example of that, although I think there's been a suggestion that user agents will never collect when the connection is still open either, so maybe that should be a must not instead.

(I hope that at some point JS/IDL formalize some of these aspects better so we can ground terminology like "weak reference" in terms of a larger web platform memory model.)

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