xTaskCatchUpTicks() function

This function corrects the tick count value after the application code has held interrupts disabled for an extended period resulting in tick interrupts having been missed. This function is similar to vTaskStepTick(), however, unlike vTaskStepTick(), xTaskCatchUpTicks() may move the tick count forward past a time at which a task should be removed from the blocked state. That means tasks may have to be removed from the blocked state as the tick count is moved.