[llvm] AMDGPU/GlobalISel: add RegBankLegalize rules for bitfield extract (PR #132381)

[Petar Avramovic via llvm-commits]

petar-avramovic wrote:

### Merge activity

* **May 26, 9:58 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/132381).


https://github.com/llvm/llvm-project/pull/132381