Import Mbed OS hard-float snapshot

UNITTESTS/target_h/platform/cxxsupport/mstd_atomic

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+/*
+ * Copyright (c) 2017 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 MSTD_ATOMIC_
+#define MSTD_ATOMIC_
+
+#include <atomic>
+
+namespace mstd {
+using std::atomic;
+using std::atomic_is_lock_free;
+using std::atomic_store;
+using std::atomic_store_explicit;
+using std::atomic_load;
+using std::atomic_load_explicit;
+using std::atomic_exchange;
+using std::atomic_exchange_explicit;
+using std::atomic_compare_exchange_weak;
+using std::atomic_compare_exchange_weak_explicit;
+using std::atomic_compare_exchange_strong;
+using std::atomic_compare_exchange_strong_explicit;
+using std::atomic_fetch_add;
+using std::atomic_fetch_add_explicit;
+using std::atomic_fetch_sub;
+using std::atomic_fetch_sub_explicit;
+using std::atomic_fetch_and;
+using std::atomic_fetch_and_explicit;
+using std::atomic_fetch_or;
+using std::atomic_fetch_or_explicit;
+using std::atomic_fetch_xor;
+using std::atomic_fetch_xor_explicit;
+using std::atomic_flag;
+using std::atomic_flag_test_and_set;
+using std::atomic_flag_test_and_set_explicit;
+using std::atomic_flag_clear;
+using std::atomic_flag_clear_explicit;
+using std::atomic_init;
+using std::memory_order;
+using std::kill_dependency;
+using std::atomic_thread_fence;
+using std::atomic_signal_fence;
+}
+
+#endif