[llvm-branch-commits] [llvm] AMDGPU: Add a few mfma test with immediate splat src2 (PR #150627)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

### Merge activity

* **Jul 25, 4:01 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/150627).


https://github.com/llvm/llvm-project/pull/150627