[llvm] AMDGPU: Add basic verification for mfma scale intrinsics (PR #117048)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Nov 22, 3:11 PM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/117048).


https://github.com/llvm/llvm-project/pull/117048