chore: import upstream snapshot with attribution

paddle/phi/kernels/gpu/ap_facade_kernel.cu

@@ -0,0 +1,49 @@
+// Copyright (c) 2025 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.
+
+#include "paddle/phi/kernels/gpu/ap_facade_kernel.h"
+#include "paddle/common/enforce.h"
+#include "paddle/phi/backends/gpu/gpu_context.h"
+#include "paddle/phi/core/dense_tensor.h"
+#include "paddle/phi/core/kernel_registry.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void ApFacadeKernel(const Context& dev_ctx,
+                    const optional<std::vector<const DenseTensor*>>& xs,
+                    int64_t num_outputs,
+                    const std::string& custom_op_name,
+                    const std::string& infer_meta_func_name,
+                    const std::string& infer_symbolic_func_name,
+                    const std::string& serialized_attributes,
+                    std::vector<DenseTensor*> outs) {
+  PADDLE_THROW(
+      common::errors::Unimplemented("ap_facade has no kernel registered."));
+}
+
+}  // namespace phi
+
+PD_REGISTER_KERNEL(ap_facade,
+                   GPU,
+                   ALL_LAYOUT,
+                   phi::ApFacadeKernel,
+                   float,
+                   double,
+                   int,
+                   phi::bfloat16,
+                   phi::float16,
+                   int64_t,
+                   phi::complex64,
+                   phi::complex128) {}