[llvm] [AMDGPU] Move `AMDGPUAttributorPass` to full LTO post link stage (PR #102086)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Then the question would be, is AMDGPUAttributorPass mandatory?

It cannot be mandatory. Something is broken

https://github.com/llvm/llvm-project/pull/102086