[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
> > 
> > 
> > Very likely the case. I checked the IR of my previously reverted PR. The only difference between the working version and mine is an extra address space cast, which is legit. Then it fails the blender test.
> 
> Blender is part of PSDB for amd-staging. Even if we remove it from buildbot, chances are PSDB will fail and what is worse is that we have to do manual regression analysis to identify the causing commit.

Does it mean I can't merge anything if blender test fails, even not because of my changes? I have a list of planned PRs that will be based on those reverted PRs.

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