[clang] [CIR] Add the ability to detect if SwitchOp covers all the cases (PR #171246)

[Henrich Lauko via cfe-commits]

================
@@ -1173,7 +1178,8 @@ def CIR_SwitchOp : CIR_Op<"switch", [
     ```
   }];
 
-  let arguments = (ins CIR_IntType:$condition);
+  let arguments = (ins CIR_IntType:$condition,
+                       DefaultValuedAttr<BoolAttr, 
"false">:$allEnumCasesCovered);
----------------
xlauko wrote:

This should be UnitAttr:

```suggestion
  let arguments = (ins 
    CIR_IntType:$condition,
    UnitAttr:$all_enum_cases_covered
  );
```

https://github.com/llvm/llvm-project/pull/171246
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