[llvm] [AMDGPU] Use ELF mangling in data layout (PR #95219)

[Scott Linder via llvm-commits]

https://github.com/slinder1 approved this pull request.

LGTM, I wonder if we want to mass update any tests with a `datalayout`, or if that isn't worth the churn?

I don't imagine this will have an impact on the loader or anything else downstream, or at least if it does it represents a bug there rather than in the compiler.

https://github.com/llvm/llvm-project/pull/95219