Integrate LLVM at llvm/llvm-project@0b161def6cac
Integrate LLVM at llvm/llvm-project@0b161def6cac

Updates LLVM usage to match
[0b161def6cac](https://github.com/llvm/llvm-project/commit/0b161def6cac)

PiperOrigin-RevId: 323983864

google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,iree-org/iree