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

[Thorsten Schütt via llvm-commits]

================
@@ -1,4 +1,5 @@
-# RUN: not --crash llc -verify-machineinstrs -run-pass none -o /dev/null %s 2>&1 | FileCheck %s
+# RUN: not --crash llc -verify-machineinstrs -mtriple=arm64 -run-pass none -o /dev/null %s 2>&1 | FileCheck %s
+# REQUIRES: aarch64-registered-target
----------------
tschuett wrote:

```
********************
********************
Failed Tests (3):
  LLVM :: MachineVerifier/test_g_extract_subvector.mir
  LLVM :: MachineVerifier/test_g_insert_subvector.mir
  LLVM :: MachineVerifier/test_g_vscale.mir


Testing Time: 1.52s

Total Discovered Tests: 98
  Unsupported      : 15 (15.31%)
  Passed           : 77 (78.57%)
  Expectedly Failed:  3 (3.06%)
  Failed           :  3 (3.06%)
FAILED: test/CMakeFiles/check-llvm-machineverifier
```

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