[clang] [CIR][Passes] Add CallConvLowering pass skeleton (PR #189613)

[Sirui Mu via cfe-commits]

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@@ -0,0 +1,58 @@
+//===- CallConvLowering.cpp - Rewrites functions according to call convs --===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/IR/BuiltinOps.h"
+#include "mlir/Pass/Pass.h"
+#include "clang/CIR/Dialect/IR/CIRDialect.h"
+
+#define GEN_PASS_DEF_CALLCONVLOWERING
+#include "clang/CIR/Dialect/Passes.h.inc"
+
+namespace cir {
+
+struct CallConvLowering {
+  CallConvLowering(mlir::ModuleOp module) : module(module) {}
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Lancern wrote:

The name `module` conflicts with the C++20 keyword.

```suggestion
  CallConvLowering(mlir::ModuleOp modOp) : modOp(modOp) {}
```

https://github.com/llvm/llvm-project/pull/189613