[llvm] [AMDGPU][True16][CodeGen] Avoid setting hi part in copysign (PR #160891)

[Piotr Sobczak via llvm-commits]

piotrAMD wrote:

> Is this the same issue that #157032 fixes

Thanks - that definitely looks related - will confirm.

https://github.com/llvm/llvm-project/pull/160891