[llvm-branch-commits] [llvm] AMDGPU: Replace some test i32 undef uses with poison (PR #131092)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

### Merge activity

* **Mar 13, 9:03 AM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/131092).


https://github.com/llvm/llvm-project/pull/131092