[llvm] AMDGPU: Fix s_barrier_leave to write to scc (PR #161221)

[Petar Avramovic via llvm-commits]

petar-avramovic wrote:

### Merge activity

* **Sep 30, 10:53 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/161221).


https://github.com/llvm/llvm-project/pull/161221