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MDEV-22456 after-merge fix: introduce Atomic_relaxed
In the merge 9e6e435 we made Atomic_counter a more generic wrapper of std::atomic so that dict_index_t would support the implicit assignment operator. It is better to revert the changes to Atomic_counter and instead introduce Atomic_relaxed as a generic wrapper to std::atomic. Unlike Atomic_counter, we will not define operator++, operator+= or similar, because we want to make the operations more explicit in the users of Atomic_wrapper, because unlike loads and stores, atomic read-modify-write operations always incur some overhead.
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