[Tile-serving] [openstreetmap/osm2pgsql] Possible performance improvement (#1532)

[doskabouter]

While importing a full planet into postgres I noticed that at the stage where it's creating the indices (after "Reading input files done") osm2pgsql is still using almost 64GB of memory (with a large part of it still in memory i.e. not in swap) presumably it's the nodes and probably other caches.
As these are not needed anymore after processing input files, perhaps that memory could be free'd so postgres itself has more memory to use as a file-cache


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