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

>  export function CloseReadableStream(stream) {
> -  stream._state = 'closed';
> +  if (stream._readableStreamReader !== undefined) {
> +    if (stream._state === 'waiting') {
> +      stream._readableStreamReader._resolveReadyPromise(undefined);
> +    }
> +
> +    // rs.ready() was pending because there was a reader.
> +    stream._resolveReadyPromise(undefined);

Thanks. Done. And this revealed one bug in `releaseLock()` that is calling _resolveReadyPromise() only when the state is `"readable"`. Fixed.

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