[llvm] [AMDGPU][test]added unique and sort options for update_mc_test_check script (PR #111769)

[Joe Nash via llvm-commits]

Sisyph wrote:

Since this script is now being used for in tree tests (https://github.com/llvm/llvm-project/commit/b27acebe63b128feb3bb9c3c62d77f235d2e6a6e) , I would recommend landing it now. If anything arises in post commit review, please re-run the script on the affected tests.

https://github.com/llvm/llvm-project/pull/111769