Re: [heycam/webidl] void -> undefined, and allow it anywhere. (#906)

Ah yeah, and on further consideration, even if I split the grammar it wouldn't help, because doing so would also strongly break the LL(1) nature of the grammar, instead now requiring infinite lookahead to parse (because an `undefined` in the very last token of a very large union would affect which grammar you're parsing with). I'm pretty sure that's a no-go right away, then.

I'll remove the const bit and add a prose restriction, one sec.

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