[clang] [lld] [llvm] AMDGPU: Use ELF mangling in data layout (PR #163011)

[Matt Arsenault via cfe-commits]

arsenm wrote:

We should just delete the hardcoded datalayouts out of device libs (really we should delete the IR there altogether, but the datalayout is unnecessary)

https://github.com/llvm/llvm-project/pull/163011