Method SpinLock

src/vector/vdebug.cpp:386–390

struct SpinLock {
    SpinLock(std::atomic_flag& flag) : m_flag(flag)
    {
        while (m_flag.test_and_set(std::memory_order_acquire))
            ;
    }

    ~SpinLock() { m_flag.clear(std::memory_order_release); }