[llvm] [CodeGen] computeRegisterProperties - fix `bf16` to `i16` bitcast quieting NaNs (PR #224867)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

All the AMDGPU test churn doesn't make much sense given there aren't any typed registers 

https://github.com/llvm/llvm-project/pull/224867