[Patch] Fix variant::operator= on references

[Jonathan Wakely]

On 22/09/16 01:49 -0700, Tim Shen wrote:
>Done. When writing the initial version, I was trying to save as much
>qualifications as possible (as long as the semantic doesn't change)
>for readability, but that might not be a good idea.

It does change the semantics, as forward<_Tp>(__tp) can find another
function via ADL (see the new test in this patch).

Tested powerpc64le-linux, committed to trunk.


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