[whatwg/streams] Remove TransformStream _readableClosed member (#782)

Instead inspect the state of the ReadableStream directly using a new abstract
operation, ReadableStreamDefaultControllerIsErroredOrCloseRequested.

This avoids redundant state tracking.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/782

-- Commit Summary --

  * Remove TransformStream _readableClosed member

-- File Changes --

    M index.bs (14)
    M reference-implementation/lib/readable-stream.js (15)
    M reference-implementation/lib/transform-stream.js (19)

-- Patch Links --

https://github.com/whatwg/streams/pull/782.patch
https://github.com/whatwg/streams/pull/782.diff

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