[llvm] [GISel] Improve MachineVerifier for G_SCMP/UCMP. (PR #120017)

[Matt Arsenault via llvm-commits]

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@@ -1627,18 +1626,18 @@ void MachineVerifier::verifyPreISelGenericInstruction(const MachineInstr *MI) {
       break;
     }
 
+    if (DstTy.getScalarSizeInBits() < 2) {
+      report("result type must be at least 2 bits wide", MI);
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arsenm wrote:

The programming guide actually states to use lowercase error messages, but there are many violations 

https://github.com/llvm/llvm-project/pull/120017