[llvm] AMDGPU/GlobalISel: Add regbanklegalize rules for uniform global loads (PR #145909)

[Petar Avramovic via llvm-commits]

petar-avramovic wrote:

### Merge activity

* **Jul 23, 2:30 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/145909).


https://github.com/llvm/llvm-project/pull/145909