[Bug 276104] [exp-run] Against llvm-18-update branch on GitHub

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276104

--- Comment #169 from commit-hook@FreeBSD.org ---
A commit in branch stable/14 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=f5fb251a553e95a84fcff8ed4a79a9659582019a

commit f5fb251a553e95a84fcff8ed4a79a9659582019a
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-05-30 15:35:15 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-06-02 09:30:42 +0000

    Merge commit 9f85bc834b07 from llvm-project (by Nikita Popov):

      [PPCMergeStringPool] Only replace constant once (#92996)

      In #88846 I changed this code to use RAUW to perform the replacement
      instead of manual updates -- but kept the outer loop, which means we try
      to perform RAUW once per user. However, some of the users might be freed
      by the RAUW operation, resulting in use-after-free.

      The case where this happens is constant users where the replacement
      might result in the destruction of the original constant.

      Fixes https://github.com/llvm/llvm-project/issues/92991.

    This fixes a possible crash when building crypto/openssh/sshkey.c for
    PowerPC targets.

    Reported by:    cperciva
    PR:             276104
    MFC after:      3 days

    (cherry picked from commit f30188c4680a85126e793de157b851bf5ee47529)

 .../llvm/lib/Target/PowerPC/PPCMergeStringPool.cpp | 37 ++++------------------
 1 file changed, 7 insertions(+), 30 deletions(-)

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