[clang] [llvm] Revert "AMDGPU: Move attributor into optimization pipeline (#83131)" and follow up commit "clang/AMDGPU: Defeat attribute optimization in attribute test" (PR #98851)

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dyung wrote:

@arsenm the previous two bot failure notifications are from your reapplication of your changes, not from my original revert. Not sure why it is mentioning it here.

https://github.com/llvm/llvm-project/pull/98851