Re: [whatwg/fetch] Proposal: fetch with multiple AbortSignals (#905)

@jakearchibald there is a memory leak if a not-first signals has already been aborted.

The fix:

```ts
function anySignal(signals: Iterable<AbortSignal>): AbortSignal {
  const controller = new AbortController();

  for (const signal of signals) {
    if (signal.aborted) {
        controller.abort(signal.reason); // add this
        return signal;
    }

    signal.addEventListener("abort", () => controller.abort(signal.reason), {
      signal: controller.signal,
    });
  }

  return controller.signal;
}
```

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