[Bug 279131] base/llvm18 ports broken with march=native on old cpu

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279131

            Bug ID: 279131
           Summary: base/llvm18 ports broken with march=native on old cpu
           Product: Base System
           Version: 14.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: standards
          Assignee: standards@FreeBSD.org
          Reporter: tonve@ya.ru

git branch stable/14, 14.1-STABLE stable/14-n267682-626ee3cac845 GENERIC amd64
host cpu ryzen 5950 has no avx512 extension

I've got the same error with march=native flag while trying to build ports
which using system CC (chrome, libreoffice)
https://github.com/llvm/llvm-project/issues/91719

Please merge patch from upstream
https://github.com/llvm/llvm-project/commit/87f3407856e61a73798af4e41b28bc33b5bf4ce6

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