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

[Tim Shen]

At Issaquah we decided to remove the supports above.

Bootstrapped and tested on x86_64-linux-gnu.

Thanks!


-- 
Regards,
Tim Shen
-------------- next part --------------
A non-text attachment was scrubbed...
Name: a.diff
Type: text/x-patch
Size: 14541 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20161112/02eaa24c/attachment.bin>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Changelog
Type: application/octet-stream
Size: 214 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20161112/02eaa24c/attachment.obj>