Derive QThreadPool thread names from the QThreadPool object name

void QThreadPoolPrivate::startThread(QRunnable *runnable)
{
    Q_ASSERT(runnable != nullptr);
    QScopedPointer <QThreadPoolThread> thread(new QThreadPoolThread(this));
    thread->setObjectName(QLatin1String("Thread (pooled)"));
    Q_ASSERT(!allThreads.contains(thread.data())); // if this assert hits, we have an ABA problem (deleted threads don't get removed here)
    allThreads.insert(thread.data());
    ++activeThreads;

    thread->runnable = runnable;
    thread.take()->start();
}

Q_Q(const QThreadPool);
const auto pool_name = q->objectName();
thread->setObjectName(pool_name.isEmpty() ? "Thread (pooled)" : pool_name);