[llvm] [DirectX] FIX 'tools/dxil-dis/debug-info.ll' test (PR #122052)

[Tex Riddell via llvm-commits]

https://github.com/tex3d approved this pull request.

Looks good.  We'll likely need to revisit the metadata we want preserved on functions at some point, but removing it doesn't seem like it should be part of `translateBranchMetadata` in any case.

https://github.com/llvm/llvm-project/pull/122052