[clang] [CIR] Clean up ptr_stride assembly format (PR #162138)

[Henrich Lauko via cfe-commits]

xlauko wrote:

### Merge activity

* **Oct 6, 7:57 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/162138).


https://github.com/llvm/llvm-project/pull/162138