chore: import upstream snapshot with attribution

tensorflow/compiler/mlir/quantization/common/func.h

@@ -0,0 +1,31 @@
+/* Copyright 2024 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+#ifndef TENSORFLOW_COMPILER_MLIR_QUANTIZATION_COMMON_FUNC_H_
+#define TENSORFLOW_COMPILER_MLIR_QUANTIZATION_COMMON_FUNC_H_
+
+#include "mlir/Dialect/Func/IR/FuncOps.h"  // from @llvm-project
+#include "mlir/IR/BuiltinOps.h"  // from @llvm-project
+
+namespace mlir::quant {
+
+// Returns a public `func::FuncOp` in `module_op` whose name matches either
+// `main` or `serving_default`. If `func::FuncOps` with both names exist, the
+// function with name "main" takes precedence. Returns null if no such a
+// function exists.
+func::FuncOp FindMainFuncOp(ModuleOp module_op);
+
+}  // namespace mlir::quant
+
+#endif  // TENSORFLOW_COMPILER_MLIR_QUANTIZATION_COMMON_FUNC_H_