Re: [whatwg/streams] Marking promise rejections as handled (#547)

If I understand correctly, there is a visibility difference to JS:

with lazy initialisation, doing

```javascript
reader.ready.then(() => something());
```

would result in an `unhandledrejection` event, but never touching `reader.ready` at all would not.

If we mark the promise as handled, then neither would result in an `unhandledrejection` event.

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