Re: [heycam/webidl] It is unclear if [AllowShared] BufferSource is valid (#961)

See also #342 and #865.

My current thinking on this:

* SharedArrayBuffer should be its own IDL type. We should not overload the ArrayBuffer IDL type to being able to represent ArrayBuffer and SharedArrayBuffer JS types.
* [AllowShared] only applies to ArrayBufferView types.
* We should leave BufferSource as-is.
* We should add SharedBufferSource that also accepts SharedArrayBuffer and that uses [AllowShared] in front of ArrayBufferView.

The outcome of that might well be that [AllowShared] BufferSource is valid as [AllowShared] would end up ignored for ArrayBuffer. I don't have strong feelings about that.

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