[heycam/webidl] Deduplicate unforgeable member functions (#668)

This avoids creating a new function object for every instance.

This change is already implemented in Gecko and Chromium.

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=28739.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/668

-- Commit Summary --

  * Deduplicate unforgeable member functions

-- File Changes --

    M index.bs (17)

-- Patch Links --

https://github.com/heycam/webidl/pull/668.patch
https://github.com/heycam/webidl/pull/668.diff

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