[llvm] [AMDGPU][SDAG] DAGCombine PTRADD -> disjoint OR (PR #146075)

[Fabian Ritter via llvm-commits]

ritter-x2a wrote:

### Merge activity

* **Sep 19, 9:57 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/146075).


https://github.com/llvm/llvm-project/pull/146075