[llvm] [llvm][offload] Move AMDGPU offload utilities to LLVM (PR #102487)

[Fabian Mora via llvm-commits]

fabianmcg wrote:

Yes, we have `llvm/Frontend/Offloading/Utility.h`, I can move it there.

However, I didn't add it there because the files have different purposes, one is almost entirely for offload entries and the other ELF utilities.

https://github.com/llvm/llvm-project/pull/102487