[all-commits] [llvm/llvm-project] 3a0ef2: [libc++] Reland LWG2921 and LWG2976 (#107960)

[A. Jiang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3a0ef2a2d3113d162d0133d7384df52abb2e3d92
      https://github.com/llvm/llvm-project/commit/3a0ef2a2d3113d162d0133d7384df52abb2e3d92
  Author: A. Jiang <de34 at live.cn>
  Date:   2024-09-11 (Wed, 11 Sep 2024)

  Changed paths:
    M libcxx/docs/Status/Cxx17Issues.csv
    M libcxx/docs/Status/Cxx20Issues.csv
    M libcxx/include/future
    M libcxx/test/std/thread/futures/futures.task/futures.task.members/ctor2.compile.pass.cpp

  Log Message:
  -----------
  [libc++] Reland LWG2921 and LWG2976 (#107960)

They were originally implemented in d42db7e083ee0 but reverted later in
a2f3c63282330be0.

This PR implement both LWG issues again, guarding the removed functions
with `_LIBCPP_STD_VER <= 14`, because they should be treated as patches 
for P0302R1 which was adopted for C++17.

Fixes #103598
Fixes #103755



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