[llvm] [AMDGPU] Fix broken XCNT Test cases (PR #160812)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> > Can you fix the description, this sounds like it is only fixing tests and not a functionality change
> 
> It touches the code and changes the output.

And therefore the main reviewer here is @cdevadas.

https://github.com/llvm/llvm-project/pull/160812