Re: [whatwg/streams] Align WritableStream structure with ReadableStream structure (#488)

> +    return false;
> +  }
> +
> +  return true;
> +}
> +
> +function WritableStreamAbort(stream, reason) {
> +  const state = stream._state;
> +  if (state === 'closed') {
> +    return Promise.resolve(undefined);
> +  }
> +  if (state === 'errored') {
> +    return Promise.reject(stream._storedError);
> +  }
> +
> +  assert(state === 'writable' || state === 'waiting' || state === 'closing');

First, converted `"waiting"` state into _backpressure internal slot by https://github.com/whatwg/streams/pull/488/commits/9cda324e1aa73dcbf52b658908a79afa5feba075

And tried eliminating the _backpressure variable by https://github.com/whatwg/streams/pull/488/commits/f5ebbeb01a4abf0204588d2718931e4a81a5f915

What do you think? The code after removing _backpressure is a bit slow. I'll check how much tomorrow.

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