[llvm] [MC] Fix HIP buildbot errors after 68472a3 (PR #141138)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 approved this pull request.

This follows the other targets that were changed, and it presumably fixes the regressions, so I'm going to assume it's correct for now.

https://github.com/llvm/llvm-project/pull/141138