[clang] [CIR] Emit CatchParamOp in the catch region (PR #171169)

[Amr Hesham via cfe-commits]

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@@ -1231,6 +1231,7 @@ class CIRGenFunction : public CIRGenTypeCache {
   };
 
   LexicalScope *curLexScope = nullptr;
+  mlir::Operation *currentFuncletPad = nullptr;
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AmrDeveloper wrote:

Maybe we can add it to the MissingFeatures with explanation comment 🤔 

https://github.com/llvm/llvm-project/pull/171169