[Patch] Remove variant<void>, variant<T&> and variant<>

[Jonathan Wakely]

On 15/11/16 12:08 +0000, Jonathan Wakely wrote:
>On 12/11/16 12:11 -0800, Tim Shen wrote:
>>At Issaquah we decided to remove the supports above.
>
>OK with a suitable ChangeLog, thanks.

I've adjusted your ChangeLog entry to fit under 80 columns with TAB
set to 8 spaces. I've also adjusted the pretty printer test that was
using variant<string_view&>.

Tested x86_64-linux, committed to trunk.

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