[llvm] DAG: Assert fcmp uno runtime calls are boolean values (PR #142898)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Jun 10, 1:44 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/142898).


https://github.com/llvm/llvm-project/pull/142898