[clang] [CIR] Upstream support for switch statements case kinds (PR #138003)

[Erich Keane via cfe-commits]

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@@ -253,6 +253,7 @@ mlir::LogicalResult CIRGenFunction::emitSimpleStmt(const Stmt *s,
   case Stmt::NullStmtClass:
     break;
   case Stmt::CaseStmtClass:
+  case Stmt::DefaultStmtClass:
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erichkeane wrote:

What does 'top level' switch case mean here?  I realize it is pre-existing, but trying to grok what is going on here

https://github.com/llvm/llvm-project/pull/138003