[REVISED PATCH 7/9]: C++ P0482R5 char8_t: New standard library tests

[Tom Honermann]

Attached is a revised patch that addresses changes in P0482R6.  Changes 
from the prior patch include:
- Updated the value of the __cpp_char8_t feature test macro to 201811.

Tested on x86_64-linux.

libstdc++-v3/ChangeLog:

2018-11-04  Tom Honermann  <tom@honermann.net>

      * testsuite/18_support/numeric_limits/char8_t.cc: New test cloned
      from char16_32_t.cc; validates numeric_limits<char8_t>.
      * testsuite/21_strings/basic_string/literals/types-char8_t.cc: New
      test cloned from types.cc; validates operator""s for char8_t
      returns u8string.
      * testsuite/21_strings/basic_string/literals/values-char8_t.cc: New
      test cloned from values.cc; validates construction and comparison
      of u8string values.
      * testsuite/21_strings/basic_string/requirements/
      /explicit_instantiation/char8_t/1.cc: New test cloned from
      char16_t/1.cc; validates explicit instantiation of
      basic_string<char8_t>.
      * testsuite/21_strings/basic_string_view/literals/types-char8_t.cc:
      New test cloned from types.cc; validates operator""sv for char8_t
      returns u8string_view.
      * testsuite/21_strings/basic_string_view/literals/
      values-char8_t.cc: New test cloned from values.cc; validates
      construction and comparison of u8string_view values.
      * testsuite/21_strings/basic_string_view/requirements/
      explicit_instantiation/char8_t/1.cc: New test cloned from
      char16_t/1.cc; validates explicit instantiation of
      basic_string_view<char8_t>.
      * testsuite/21_strings/char_traits/requirements/char8_t/65049.cc:
      New test cloned from char16_t/65049.cc; validates that
      char_traits<char8_t> is not vulnerable to the concerns in PR65049.
      * testsuite/21_strings/char_traits/requirements/char8_t/
      typedefs.cc: New test cloned from char16_t/typedefs.cc; validates
      that char_traits<char8_t> member typedefs are present and correct.
      * testsuite/21_strings/char_traits/requirements/
      explicit_instantiation/char8_t/1.cc: New test cloned from
      char16_t/1.cc; validates explicit instantiation of
      char_traits<char8_t>.
      * testsuite/22_locale/codecvt/char16_t-char8_t.cc: New test cloned
      from char16_t.cc: validates
      codecvt<char16_t, char8_t, mbstate_t>.
      * testsuite/22_locale/codecvt/char32_t-char8_t.cc: New test cloned
      from char32_t.cc: validates
      codecvt<char32_t, char8_t, mbstate_t>.
      * testsuite/22_locale/codecvt/utf8-char8_t.cc: New test cloned from
      utf8.cc; validates codecvt<char16_t, char8_t, std::mbstate_t> and
      codecvt<char32_t, char8_t, std::mbstate_t>.
      * testsuite/27_io/filesystem/path/native/string-char8_t.cc: New
      test cloned from string.cc; validates filesystem::path construction
      from char8_t input.
      * testsuite/experimental/feat-char8_t.cc: New test; validates that
      the __cpp_lib_char8_t feature test macro is defined with the
      correct value.
      * testsuite/experimental/filesystem/path/native/string-char8_t.cc:
      New test cloned from string.cc; validates filesystem::path
      construction from char8_t input.
      * testsuite/experimental/string_view/literals/types-char8_t.cc: New
      test cloned from types.cc; validates operator""sv for char8_t
      returns u8string_view.
      * testsuite/experimental/string_view/literals/values-char8_t.cc:
      New test cloned from values.cc; validates construction and
      comparison of u8string_view values.
      * testsuite/experimental/string_view/requirements/
      explicit_instantiation/char8_t/1.cc: New test cloned from
      char16_t/1.cc; validates explicit instantiation of
      basic_string_view<char8_t>.
      * testsuite/ext/char8_t/atomic-1.cc: New test; validates that
      ATOMIC_CHAR8_T_LOCK_FREE is not defined if char8_t support is not
      enabled.

Tom.


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