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

[Bruno Cardoso Lopes via cfe-commits]

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@@ -1106,6 +1106,7 @@ mlir::LogicalResult CIRGenFunction::emitSwitchStmt(const clang::SwitchStmt &s) {
     terminateBody(builder, caseOp.getCaseRegion(), caseOp.getLoc());
   terminateBody(builder, swop.getBody(), swop.getLoc());
 
+  swop.setHandlingEnum(s.getCond()->IgnoreParenImpCasts()->getType()->isEnumeralType());
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bcardosolopes wrote:

Assuming `s.isAllEnumCasesCovered()` implies this is an enum, the type should be `isEnumeralType` everytime that returns true? Might be worth adding an assert here in case somehow they differ

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