[llvm] [llvm] Fix GNU/Hurd build (PR #184470)

[Sam James via llvm-commits]

https://github.com/thesamesam approved this pull request.

LGTM, thanks. @MaskRay any issues? If not I'll merge it in a few days, as I couldn't find another reviewer.

https://github.com/llvm/llvm-project/pull/184470