Fix race condition in task queue

To avoid lock contention, our task system queues tasks in several
queues. In order to know when there is no more work to be done, a
global counter keeps track of the total work. Here, it is important
that this counter be incremented before a value is added to the
queue, for otherwise some other thread could pick it up and decrement
the total work load, hence getting us in a state where the counter
underestimates the total amount of work to be done. Fix the order
of those operations.

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