[all-commits] [llvm/llvm-project] ee95c7: [libc++] Remove _LIBCPP_CONSTEXPR_AFTER_CXX17_WITH...

[Quuxplusone via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: ee95c7020cebe4668a501f24305a76a044df5266
      https://github.com/llvm/llvm-project/commit/ee95c7020cebe4668a501f24305a76a044df5266
  Author: Arthur O'Dwyer <arthur.j.odwyer at gmail.com>
  Date:   2020-11-24 (Tue, 24 Nov 2020)

  Changed paths:
    M libcxx/include/__config
    M libcxx/include/__string
    M libcxx/include/algorithm
    M libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp
    M libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp
    M libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
    M libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp

  Log Message:
  -----------
  [libc++] Remove _LIBCPP_CONSTEXPR_AFTER_CXX17_WITH_IS_CONSTANT_EVALUATED.

Zoe Carver says: "We decided that libc++ only supports C++20 constexpr algorithms
when `is_constant_evaluated` is also supported. Here's a link to the discussion."
https://reviews.llvm.org/D65721#inline-735682

Remove _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED from tests, too.
See Louis's 5911e6a8857f146fb5a8f23af1d768aba25e7c3e if needed to fix bots.
I've applied `UNSUPPORTED: clang-8` preemptively to the altered tests;
I don't know for sure that this was needed, because no clang-8 buildbots
are triggered on pull requests.