chore: import upstream snapshot with attribution

paddle/ap/include/kernel_dispatch/ap_variadic_kernel.h

@@ -0,0 +1,41 @@
+// Copyright (c) 2024 PaddlePaddle 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.
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "paddle/ap/include/adt/adt.h"
+#include "paddle/ap/include/kernel_dispatch/device_ctx.h"
+
+namespace phi {
+
+class DenseTensor;
+
+}
+
+namespace ap::kernel_dispatch {
+
+adt::Result<adt::Ok> ApVariadicKernel(
+    const DeviceCtx& device_ctx,
+    const std::vector<const phi::DenseTensor*>& xs,
+    int num_outputs,
+    const std::string& kernel_define_lambda,
+    const std::string& infer_meta_lambda,
+    const std::string& kernel_dispatch_lambda,
+    const std::string& kernel_dispatch_const_data_lambda,
+    std::vector<phi::DenseTensor*> outs);
+
+}  // namespace ap::kernel_dispatch