Re: [whatwg/dom] Add abort reason to AbortSignal (PR #1027)

This is an optional suggestion but it may be good to introduce a predicate just for convenience.

```
An AbortSignal is aborted when its abort reason is undefined.
```

See https://fetch.spec.whatwg.org/#body-unusable, https://streams.spec.whatwg.org/#readablestream-readable for examples.

The difference between the predicate and the aborted flag is we don't need to update the flag.

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