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

[alex85k]

I have a failing test in Windows debug build (it has additional STL checks) because of iterator assertion. Release tests pass but it may depend on memory state.

Here is the problematic place in libosmium:
https://github.com/osmcode/libosmium/blob/ab8236405330607932c8f6395956ec6d9bcdee5c/include/osmium/area/detail/basic_assembler.hpp#L648
(iterator from different list? using invalidated iterator after erase?)

Failing test is test-output-pgsql-validgeom, it is failing on last multipolygon of the test file (relation id="4621350")
May be related to https://github.com/openstreetmap/osm2pgsql/issues/745

![image](https://cloud.githubusercontent.com/assets/4124648/25164852/c9a888f6-24ec-11e7-879c-e0722bc71cdd.png)


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