Re: [streams] Byte stream update, including reference implementation (#361)

> +
> +  releaseLock() {
> +    if (!IsReadableByteStreamByobReader(this)) {
> +      throw new TypeError(
> +          'ReadableByteStreamByobReader.prototype.releaseLock can only be used on a ReadableByteStreamByobReader');
> +    }
> +
> +    if (this._ownerReadableByteStream === undefined) {
> +      return;
> +    }
> +
> +    if (this._readIntoRequests.length > 0) {
> +      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
> +    }
> +
> +    if (this._ownerReadableByteStream._state === 'readable') {

Also added some auto release tests f174dd56021e124aa055566a53bd95145a85f180

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