[PATCH] libstdc++: std::variant doesn't like types with a defaulted virtual destructor [PR95915]

[Ville Voutilainen]

This patch also deprecates std::is_literal_type.

2020-06-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

    PR libstdc++/95915
    * include/std/type_traits (is_literal_type, is_literal_type_v):
    Deprecate in C++17.
    * include/std/variant (_Uninitialized):
    Adjust the condition and the comment.
    * testsuite/20_util/is_literal_type/deprecated-1z.cc: New.
    * testsuite/20_util/is_literal_type/requirements/explicit_instantiation.cc:
    Adjust.
    * testsuite/20_util/is_literal_type/requirements/typedefs.cc: Likewise.
    * testsuite/20_util/is_literal_type/value.cc: Likewise.
    * testsuite/20_util/variant/95915.cc: New.
    * testsuite/20_util/variant/compile.cc: Add new test.
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