[whatwg/streams] Performance improvements (#490)

- Avoid use of Object.defineProperty for enumerable / writable / configurable
  properties.
- Merge two adjacent try/catch statements into one.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/490

-- Commit Summary --

  * Performance improvements

-- File Changes --

    M reference-implementation/lib/helpers.js (20)

-- Patch Links --

https://github.com/whatwg/streams/pull/490.patch
https://github.com/whatwg/streams/pull/490.diff

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