Re: [streams] Have each of the stream and reader hold promises (#277)

> @@ -11,17 +12,17 @@ export default class ExclusiveStreamReader {
>        throw new TypeError('This stream has already been locked for exclusive reading by another reader');
>      }
>  
> -    stream._readableStreamReader = this;
> +    AttachExclusiveStreamReader(stream, this);

Any reason not to inline this? It seems to be only used in one place. Same with detach. I don't feel strongly though so if you think it's clearer we can keep it.

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