chore: import upstream snapshot with attribution

paddle/phi/api/lib/utils/allocator.h

@@ -0,0 +1,37 @@
+/* Copyright (c) 2021 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 "paddle/phi/common/memory_utils.h"
+#include "paddle/phi/common/place.h"
+#include "paddle/phi/core/allocator.h"
+
+namespace paddle {
+namespace experimental {
+
+class DefaultAllocator : public phi::Allocator {
+ public:
+  explicit DefaultAllocator(const phi::Place& place) : place_(place) {}
+
+  AllocationPtr Allocate(size_t bytes_size) override {
+    return phi::memory_utils::Alloc(place_, bytes_size);
+  }
+
+ private:
+  phi::Place place_;
+};
+
+}  // namespace experimental
+}  // namespace paddle