[llvm] [AMDGPU][test]added remove duplicate options for update_mc_test_check script (PR #111769)

[Ivan Kosarev via llvm-commits]

https://github.com/kosarev commented:

What is your idea about sorting all-comments cases, like:

```
// FIXME: For atomic instructions, glc must be placed immediately following
// the data regiser.  These forms aren't currently supported:
// FIXME: offset:0 required
// flat_atomic_add v1, v[3:4], v5 slc glc
```

?

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