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

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

--- Comment #59 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=edc2dc17b1f2dfe45dc85e6cc0ff54bca1ac8214

commit edc2dc17b1f2dfe45dc85e6cc0ff54bca1ac8214
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-01-02 16:07:31 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-04-06 20:13:11 +0000

    Revert commit 0e46b49de433 from llvm-project (by Matt Arsenault):

      Reapply "RegisterCoalescer: Add implicit-def of super register when
coalescing SUBREG_TO_REG"

      This reverts commit c398fa009a47eb24f88383d5e911e59e70f8db86.

      PPC backend was fixed in 2f82662ce901c6666fceb9c6c5e0de216a1c9667

    Since it causes an assertion failure building /sys/dev/fb/vga.c:
    https://github.com/llvm/llvm-project/issues/76416

    PR:             276104
    MFC after:      1 month

 .../llvm/lib/CodeGen/RegisterCoalescer.cpp         | 51 ++++------------------
 1 file changed, 9 insertions(+), 42 deletions(-)

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