[llvm] [GlobalIsel] Add G_SCMP and G_UCMP instructions (PR #98894)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

There are still failures with:
```
  LLVM :: TableGen/GlobalISelCombinerEmitter/match-table-cxx.td
  LLVM :: TableGen/GlobalISelEmitter.td
```
Is the solution update script or manual work? The failures are probably related to adding new instructions.

https://github.com/llvm/llvm-project/pull/98894