[Tile-serving] [openstreetmap/osm2pgsql] Potential memory problem in libosmium? (#746)

[Jochen Topf]

@alex85k could you check a few things to narrow this down?

* The area assembler expects the input to be sorted. This is not the case here. Can you sort the input file (or use [this](https://tmp.jochentopf.com/d049fd2f6f954c6c2658cbcf562b65b4/test_output_pgsql_validgeom_sort.osm)) and check then?
* Could you check `examples/osmium_area_test` from libosmium and see whether it has the same problem? This would help in figuring out whether it is a libosmium problem (which I expect) or something related to how osm2pgsql uses libosmium.
* Could you try switching [these two lines](https://github.com/osmcode/libosmium/blob/master/include/osmium/area/detail/basic_assembler.hpp#L648-L649).

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