[heycam/webidl] Disallow combining an indexed getter with a maplike/setlike (#671)

This avoids the ambiguity around which @@iterator to use. This combination is
not currently used; if a use case comes up, we can reconsider this.

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=28592.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/671

-- Commit Summary --

  * Disallow combining an indexed getter with a maplike/setlike

-- File Changes --

    M index.bs (10)

-- Patch Links --

https://github.com/heycam/webidl/pull/671.patch
https://github.com/heycam/webidl/pull/671.diff

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