[whatwg/webidl] Give SharedArrayBuffer a dedicated type (PR #1311)

Generally IDL objects have been 1:1 with ECMAScript objects, except for SharedArrayBuffer. That was instead represented as [AllowShared] ArrayBuffer, although that includes ArrayBuffer as well. This created a number of challenges, e.g., how to return a SharedArrayBuffer object.

So we make these changes here that will also require corresponding downstream fixes:

* SharedArrayBuffer is now its own type.
* [AllowShared] only applies to buffer view types.
* AllowSharedBufferSource takes over from [AllowShared] BufferSource.

Fixes #865 and fixes #961.

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1311

-- Commit Summary --

  * Give SharedArrayBuffer a dedicated type

-- File Changes --

    M index.bs (223)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1311.patch
https://github.com/whatwg/webidl/pull/1311.diff

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