[llvm] [GISel] Handle Flags in G_PTR_ADD Combines (PR #152495)

[Fabian Ritter via llvm-commits]

ritter-x2a wrote:

### Merge activity

* **Aug 11, 8:32 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/152495).


https://github.com/llvm/llvm-project/pull/152495