[v3 PATCH] PR libstdc++/89816

[Ville Voutilainen]

I looked at the codegen of this before and after the patch, and
it does the right thing. Variant's tests run on Linux-x64. OK for
trunk?

2019-03-25  Ville Voutilainen  <ville.voutilainen@gmail.com>

    PR libstdc++/89816
    Fix based on a suggestion by Antony Polukhin.
    * include/std/variant (__variant_construct): Capture a pointer
    to the storage and visit just one variant.
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