[llvm] llvm-reduce: Fix losing callsite attributes in operand-to-args (PR #133420)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Mar 29, 5:10 AM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/133420).


https://github.com/llvm/llvm-project/pull/133420