chore: import upstream snapshot with attribution

paddle/phi/kernels/check_memory_continue_kernel.h

@@ -0,0 +1,40 @@
+// Copyright (c) 2022 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 <vector>
+
+#include "paddle/phi/core/dense_tensor.h"
+
+namespace phi {
+
+// WHY add this op?
+// This op is used for convert fused_all_reduce_op_handle in Graph to Program.
+// i.e, fused_all_reduce_op_handle = check_memory_continue + all_reduce_sum
+// There are two reasons that check_memory_continue is added:
+// 1. all_reduce_sum takes single tensor as input, while
+// fused_all_reduce_op_handle takes tensor array as input, so we need a op to
+// convert tensor array into a single tensor
+// 2. fused_all_reduce_op_handle has a premise that all tensor's addresses are
+// continue, so we need a op to do the check.
+
+// see details in fused_all_reduce_op_handle.cc
+template <typename T, typename Context>
+void CheckMemoryContinueKernel(const Context &dev_ctx,
+                               const std::vector<const DenseTensor *> &input,
+                               DenseTensor *output,
+                               std::vector<DenseTensor *> xout);
+
+}  // namespace phi