[heycam/webidl] Ensure that interface objects aren't used before they exist (#682)

We use the interface object of the inherited interface in the 'create an
interface object' algorithm, so this ensures it already exists at that point.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/682

-- Commit Summary --

  * Ensure that interface objects aren't used before they exist

-- File Changes --

    M index.bs (7)

-- Patch Links --

https://github.com/heycam/webidl/pull/682.patch
https://github.com/heycam/webidl/pull/682.diff

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https://github.com/heycam/webidl/pull/682