[whatwg/streams] Fix rethrowAssertionErrorRejection (#898)

Fixes #865
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/898

-- Commit Summary --

  * Fix rethrowAssertionErrorRejection
  * Use instanceof to check for assertion errors

-- File Changes --

    M reference-implementation/lib/utils.js (4)

-- Patch Links --

https://github.com/whatwg/streams/pull/898.patch
https://github.com/whatwg/streams/pull/898.diff

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https://github.com/whatwg/streams/pull/898