[heycam/webidl] Detached ArrayBuffer objects should not throw (#605)

Instead treat them the same as the empty byte sequence as implementations have been doing since forever.

This also performs the IsDetachedBuffer abstract operation on the correct object.

Fixes #151.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/605

-- Commit Summary --

  * Detached ArrayBuffer objects should not throw

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/heycam/webidl/pull/605.patch
https://github.com/heycam/webidl/pull/605.diff

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