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

[Shilei Tian via llvm-commits]

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+; RUN: opt -mtriple=amdgcn--amdhsa -S -passes="lto<O0>" -print-pipeline-passes %s -o - | FileCheck %s
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shiltian wrote:

Do we want to run it with `lto<O0>`?

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