[clang] [AMDGPU] Remove Code Object V3 (PR #67118)

[Andrew Stubbs via cfe-commits]

ams-cs wrote:

We're discussing replacing the devices with something newer, but there are practical and business issues with that, so no hard plans. Sorry.

I'm leaning toward officially deprecating Fiji for GCC 14, and remove it from GCC 15 (so, sometime next year). If we can get these devices replaced then it can happen sooner. For release branches we can document a fixed LLVM version to use, so it's only really the mainline development branch that is the problem.

https://github.com/llvm/llvm-project/pull/67118