[llvm] [AMDGPU] Insert readfirstlane in the function returns in sgpr. (PR #135326)

[Pankaj Dwivedi via llvm-commits]

PankajDwivedi-25 wrote:

> I reverted it.

Thanks, but why does it fail after merging? I can see all the checks passed before the merge.

https://github.com/llvm/llvm-project/pull/135326