[Bug 255374] C++20 features (headers) std::concepts, std::format, std::numbers, std::source_location, etc. are missing

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255374

--- Comment #13 from commit-hook@FreeBSD.org ---
A commit in branch stable/12 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=761122c601e849229191a097a5741eda3ab1edb4

commit 761122c601e849229191a097a5741eda3ab1edb4
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2021-06-03 18:53:18 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2021-12-25 11:51:01 +0000

    Add C++ headers <barrier> <concepts> <execution> <latch> <numbers>
<semaphore>

    I missed adding these to the libc++ Makefile, when importing
    llvm-project 11.0.0-rc1, even though they were supplied by upstream.

    While here, update OptionalObsoleteFiles.inc to add these new headers,
    and cleanup old cruft.

    Reported by:    yuri
    Submitted by:   jkim (Makefile diff)
    PR:             255374
    MFC after:      3 days

    (cherry picked from commit 95aa617e4bf09fcc813b1bab3d0dbf4b606807b1)

 lib/libc++/Makefile                      |  6 +++++
 tools/build/mk/OptionalObsoleteFiles.inc | 43 ++++++++++++++++++++------------
 2 files changed, 33 insertions(+), 16 deletions(-)

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