[llvm] [AMDGPU] Non convergent readfirstlane does not depend on EXEC. NFCI. (PR #179821)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> Is there a way to test this? LGTM otherwise

No, that's why it is NFCI. It its patent change go there will be visible impact.

https://github.com/llvm/llvm-project/pull/179821