[llvm] CodeGen: Remove redundant REQUIRES registered-target from tests (PR #111982)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Oct 11, 8:15 AM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/111982).


https://github.com/llvm/llvm-project/pull/111982