[v3 PATCH] Implement LWG 2485

[Ville Voutilainen]

2017-10-29  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Implement LWG 2485

    * include/debug/array (get(const array<_Tp, _Nm>&&)): New.
    * include/std/array (get(const array<_Tp, _Nm>&&)): Likewise.
    * include/std/tuple (get(const tuple<_Elements...>&&)): Likewise.
    (get(const tuple<_Types...>&&)): Likewise.
    * include/std/utility
    (__pair_get::__const_move_get(const std::pair<_Tp1, _Tp2>&&)):
    Likewise.
    (get(const std::pair<_Tp1, _Tp2>&&)): Likewise.
    (get(const pair<_Tp, _Up>&&)): Likewise.
    (get(const pair<_Up, _Tp>&&)): Likewise.
    * testsuite/20_util/pair/astuple/get.cc: Add tests for
    new overloads.
    * testsuite/20_util/pair/astuple/get_by_type.cc: Likewise.
    * testsuite/20_util/tuple/element_access/get2.cc: Likewise.
    * testsuite/20_util/tuple/element_access/get2_by_type.cc: Likewise.
    * testsuite/23_containers/array/tuple_interface/get.cc: Likewise.
    * testsuite/23_containers/array/tuple_interface/tuple_element_debug_neg.cc:
    Adjust.
    * testsuite/23_containers/array/tuple_interface/tuple_element_neg.cc:
    Likewise.
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