[llvm] [llvm][test] Change an XFAIL into a more correct REQUIRES (PR #137942)

[David Spickett via llvm-commits]

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

LGTM, much simpler to say the one place we can run rather than all the one's we can't.

https://github.com/llvm/llvm-project/pull/137942