[llvm] AMDGPU: Fix broken frame index expansion for v_add_co_u32_e64 (PR #114634)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Nov 4, 1:38 PM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/114634).


https://github.com/llvm/llvm-project/pull/114634