The cache statistic swapCount is never recorded

[magoorden]

The recording of the cache statistic swapCount is guarded in JFactory:

if (SWAPCOUNT) {
    cachestats.swapCount++;
}

The constant SWAPCOUNT is hard-coded in JFactory to be false. Therefore, the cachestats will never record this statistic.

[dhendriks]

This should also be moved to a separate statistic as it has nothing to do with caches.