[llvm] AMDGPU: Add test for 16 bit unsigned scratch offsets (PR #110255)

[Petar Avramovic via llvm-commits]

petar-avramovic wrote:

* **#110256** <a href="https://app.graphite.dev/github/pr/llvm/llvm-project/110256?utm_source=stack-comment-icon" target="_blank"><img src="https://static.graphite.dev/graphite-32x32-black.png" alt="Graphite" width="10px" height="10px"/></a>
* **#110255** <a href="https://app.graphite.dev/github/pr/llvm/llvm-project/110255?utm_source=stack-comment-icon" target="_blank"><img src="https://static.graphite.dev/graphite-32x32-black.png" alt="Graphite" width="10px" height="10px"/></a> 👈
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https://github.com/llvm/llvm-project/pull/110255