[whatwg/streams] assert invariants in InvokeOrNoop and friends (#584)

If this is a good idea I'll add a commit to change index.bs next.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/584

-- Commit Summary --

  * assert invariants in InvokeOrNoop and friends

-- File Changes --

    M reference-implementation/lib/helpers.js (18)

-- Patch Links --

https://github.com/whatwg/streams/pull/584.patch
https://github.com/whatwg/streams/pull/584.diff

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https://github.com/whatwg/streams/pull/584