[Bug 287803] clang internal error when building C++20 modules

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287803

--- Comment #5 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=55dfaeae8e9aa95f0b724d90ad2423ca1b623142

commit 55dfaeae8e9aa95f0b724d90ad2423ca1b623142
Author:     Lexi Winter <ivy@FreeBSD.org>
AuthorDate: 2025-06-25 17:12:02 +0000
Commit:     Lexi Winter <ivy@FreeBSD.org>
CommitDate: 2025-06-25 17:12:02 +0000

    contrib/llvm-project: fix clang crash compiling modules

    clang++ may crash when compiling certain C++20 modules.  Backport the
    fix from LLVM upstream.

    This fixes LLVM bug 102684:
    https://github.com/llvm/llvm-project/issues/102684.

    PR:     287803
    MFC after:      3 days
    Obtained from:  https://github.com/llvm/llvm-project/pull/102855
    Reviewed by:    kevans, dim
    Approved by:    kevans (mentor)
    Differential Revision:  https://reviews.freebsd.org/D51041

 .../include/clang/Frontend/MultiplexConsumer.h     |  1 +
 .../Serialization/ASTDeserializationListener.h     |  2 +
 .../clang/include/clang/Serialization/ASTReader.h  |  3 +
 .../clang/include/clang/Serialization/ASTWriter.h  |  1 +
 .../clang/lib/Frontend/MultiplexConsumer.cpp       |  5 ++
 .../clang/lib/Serialization/ASTReader.cpp          | 91 +++++++++++++++++-----
 .../clang/lib/Serialization/ASTWriter.cpp          |  6 ++
 7 files changed, 91 insertions(+), 18 deletions(-)

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