[Tile-serving] [osm2pgsql] Cache kept in indexing step (#437)

[Paul Norman]

Yes, freeing memory once out of pending would be good, since if the DB is on the same machine as osm2pgsql it would give more memory for index creation.

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https://github.com/openstreetmap/osm2pgsql/issues/437#issuecomment-141643069
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