[llvm] [AMDGPU][NFC] Added test for live-in CSR SGPR used partially giving MachineVerifier error (PR #126696)

[Christudasan Devadasan via llvm-commits]

cdevadas wrote:

Can you stack the PR https://github.com/llvm/llvm-project/pull/126926 along with it? This PR is supposed to fix the error you mentioned in this test. We should be able to see how the proposed fix changes the test if they are stacked together.

https://github.com/llvm/llvm-project/pull/126696