[clang] [CIR] Better handling of `void` function return (PR #128089)

Fri, 21 Feb 2025 09:51:15 -0800 

================
@@ -375,11 +410,48 @@ void printFuncTypeArgs(mlir::AsmPrinter &p, 
mlir::ArrayRef<mlir::Type> params,
   p << ')';
 }
 
+// Use a custom parser to handle the optional return and argument types without
+// an optional anchor.
+static mlir::ParseResult parseFuncType(mlir::AsmParser &p,
+                                       mlir::Type &optionalReturnTypes,
+                                       llvm::SmallVector<mlir::Type> &params,
+                                       bool &isVarArg) {
+  if (failed(parseFuncTypeReturn(p, optionalReturnTypes)))
+    return failure();
+  return parseFuncTypeArgs(p, params, isVarArg);
+}
+
+static void printFuncType(mlir::AsmPrinter &p, mlir::Type optionalReturnTypes,
----------------
xlauko wrote:

```suggestion
static void printFuncType(mlir::AsmPrinter &p, mlir::Type optionalReturnType,
```

https://github.com/llvm/llvm-project/pull/128089
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