[llvm] AMDGPU: Verify function type matches when matching libcalls (PR #119043)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Dec 16, 12:57 AM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/119043).


https://github.com/llvm/llvm-project/pull/119043