[llvm] [AMDGPU] Support lowering of cluster related instrinsics (PR #157978)

[Shilei Tian via llvm-commits]

shiltian wrote:

### Merge activity

* **Sep 12, 11:16 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/157978).


https://github.com/llvm/llvm-project/pull/157978