[llvm] Hexagon: Add test for llvm.exp10 intrinsic (PR #148664)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Jul 14, 11:46 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/148664).


https://github.com/llvm/llvm-project/pull/148664