[clang] [CIR] Add the ability to detect enum argument for switch op (PR #172236)

[Bruno Cardoso Lopes via cfe-commits]

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@@ -1216,7 +1216,8 @@ def CIR_SwitchOp : CIR_Op<"switch", [
 
   let arguments = (ins 
     CIR_IntType:$condition,
-    UnitAttr:$allEnumCasesCovered
+    UnitAttr:$allEnumCasesCovered,
+    UnitAttr:$handling_enum
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bcardosolopes wrote:

Another nit here: stick to one of the styles, the previous arg is using camelCase, the new one isn't.

https://github.com/llvm/llvm-project/pull/172236