[llvm] [AMDGPU] Emit AMDHSA kernel descriptors to `.amdhsa.kd` section (PR #122930)

[Ben Vanik via llvm-commits]

benvanik wrote:

Thanks @jhuber6! I patched this and confirmed it works for my usage (#119479). Looks like the test failures here were unrelated and it's ok to land?

https://github.com/llvm/llvm-project/pull/122930