[v3 PATCH] PR libstdc++/89825

[Ville Voutilainen]

Slight tweak, the condition for _M_valid and _Extra_visit_slot_needed
is now in sync.

2019-03-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

    PR libstdc++/89825
    Fix based on a suggestion by Antony Polukhin.
    * include/std/variant (__never_valueless): New.
    (_M_valid): Use it.
    (_Extra_visit_slot_needed): New.
    (_Multi_array): Use it.
    (_S_apply_all_alts): Likewise.
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