[clang] [CIR] Add structured CatchParamOp (PR #165110)

[Andy Kaylor via cfe-commits]

================
@@ -5134,6 +5134,34 @@ def CIR_TryOp : CIR_Op<"try",[
   let hasLLVMLowering = false;
 }
 
+//===----------------------------------------------------------------------===//
+// CatchParamOp
+//===----------------------------------------------------------------------===//
+
+def CIR_CatchParamOp : CIR_Op<"catch_param", [HasParent<"cir::TryOp">]> {
+  let summary = "Represents the catch clause formal parameter";
+  let description = [{
+    The `cir.catch_param` used to retrieves the exception object inside
----------------
andykaylor wrote:

```suggestion
    The `cir.catch_param` is used to retrieves the exception object inside
```

https://github.com/llvm/llvm-project/pull/165110