Re: [whatwg/webidl] Proposal: DOMException.ignoreAborts(promise) (#933)

You're right, it's no longer sufficient to only ignore `AbortError` DOMExceptions. Following the suggestion in https://github.com/whatwg/dom/pull/1027#pullrequestreview-782289936, we would need something along the lines of:
```javascript
AbortSignal.prototype.ignoreAborts = function (promise) {
  promise = Promise.resolve(promise);

  return promise.catch(e => {
    if (this.aborted && e === this.reason) {
      // swallow exception
    } else {
      // rethrow
      throw e;
    }
  });
};
```
which authors could use as:
```javascript
async butterBiscuits({ signal }) {
  try {
    const result = await signal.ignoreAborts(fetch('https://butternet/the-good-stuff?lots', { signal }));
    if (result) {
      this.biscuits.butter = result;
    }
  } catch (err) {
    alerts.push('a TERRIBLE thing happened');
    throw err;
  }
}
```
It's kind of weird that you have to use `signal` twice, though. 😕

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