[llvm] [AMDGPU] Remove dead function metadata after amdgpu-lower-kernel-arguments (PR #126147)

[Scott Linder via llvm-commits]

slinder1 wrote:

I am not certain I understand the github interface, but it seems to be saying you approved the latest  patch, so I will land and anything else can be resolved post-commit

https://github.com/llvm/llvm-project/pull/126147