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

[Shilei Tian via llvm-commits]

shiltian wrote:

> > A light breeze can cause blender to fail. Any random code perturbation will break it until the WWM spilling patches are committed
> 
> Agree. But for this PR I think it may actually caught a real issue

Then the question would be, is AMDGPUAttributorPass mandatory?

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