[llvm] [AMDGPU] Remove definition of hi16 for scalar registers (PR #197467)

[Igor Wodiany via llvm-commits]

IgWod wrote:

It looks like the change may have broken the build bot: https://lab.llvm.org/buildbot/#/builders/10/builds/29355. I'm investigating now.

https://github.com/llvm/llvm-project/pull/197467