reconnect_nodes with an unordered_set #1888
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We don't actually need an ordering here, and count/insert/etc
operations in O(1) instead of O(log(N)) might be nice.
@friedmud, try this on the case from #1859 and see if it chops anything off the write_nodesets time?
This might be another pessimization instead but it's an easy enough change to be worth trying.