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

[alex85k]

```
 	msvcp140d.dll!std::_Debug_message(const wchar_t * message, const wchar_t * file, unsigned int line) Line 17	C++
 	test-output-pgsql-validgeom.exe!std::_List_const_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > >::operator==(const std::_List_const_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > > & _Right) Line 289	C++
 	test-output-pgsql-validgeom.exe!std::list<std::_List_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > >,std::allocator<std::_List_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > > > >::remove(const std::_List_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > > & _Val) Line 1617	C++
 	test-output-pgsql-validgeom.exe!osmium::area::detail::BasicAssembler::merge_two_rings(std::list<std::_List_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > >,std::allocator<std::_List_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > > > > & open_ring_its, const osmium::area::detail::location_to_ring_map & m1, const osmium::area::detail::location_to_ring_map & m2) Line 651	C++
 	test-output-pgsql-validgeom.exe!osmium::area::detail::BasicAssembler::join_connected_rings(std::list<std::_List_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > >,std::allocator<std::_List_iterator<std::_List_val<std::_List_simple_types<osmium::area::detail::ProtoRing> > > > > & open_ring_its) Line 858	C++
 	test-output-pgsql-validgeom.exe!osmium::area::detail::BasicAssembler::create_rings_complex_case() Line 925	C++
 	test-output-pgsql-validgeom.exe!osmium::area::detail::BasicAssembler::create_rings() Line 1115	C++
 	test-output-pgsql-validgeom.exe!osmium::area::GeomAssembler::operator()(const osmium::Relation & relation, const osmium::memory::Buffer & ways_buffer, osmium::memory::Buffer & out_buffer) Line 111	C++
 	test-output-pgsql-validgeom.exe!geom::osmium_builder_t::get_wkb_multipolygon(const osmium::Relation & rel, const osmium::memory::Buffer & ways) Line 157	C++
	test-output-pgsql-validgeom.exe!output_pgsql_t::pgsql_process_relation(const osmium::Relation & rel, bool pending) Line 388	C++
 	test-output-pgsql-validgeom.exe!output_pgsql_t::relation_add(const osmium::Relation & rel) Line 443	C++
 	test-output-pgsql-validgeom.exe!osmdata_t::relation_add(const osmium::Relation & rel) Line 65	C++
 	test-output-pgsql-validgeom.exe!parse_osmium_t::relation(const osmium::Relation & rel) Line 188	C++
 	test-output-pgsql-validgeom.exe!osmium::detail::apply_item_impl<parse_osmium_t & __ptr64,osmium::memory::Item>(osmium::memory::Item & item, parse_osmium_t & handler) Line 69	C++
 	test-output-pgsql-validgeom.exe!osmium::apply_item<osmium::memory::Item,parse_osmium_t & __ptr64>(osmium::memory::Item & item, parse_osmium_t & <handlers_0>) Line 205	C++
 	test-output-pgsql-validgeom.exe!osmium::apply<osmium::io::InputIterator<osmium::io::Reader,osmium::memory::Item>,parse_osmium_t & __ptr64>(osmium::io::InputIterator<osmium::io::Reader,osmium::memory::Item> it, osmium::io::InputIterator<osmium::io::Reader,osmium::memory::Item> end, parse_osmium_t & <handlers_0>) Line 221	C++
 	test-output-pgsql-validgeom.exe!osmium::apply<osmium::io::Reader,parse_osmium_t & __ptr64>(osmium::io::Reader & c, parse_osmium_t & <handlers_0>) Line 228	C++
 	test-output-pgsql-validgeom.exe!parse_osmium_t::stream_file(const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & filename, const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & fmt) Line 129	C++
 	test-output-pgsql-validgeom.exe!testing::parse(const char * filename, const char * format, const options_t & options, osmdata_t * osmdata) Line 16	C++
 	test-output-pgsql-validgeom.exe!`anonymous namespace'::test_z_order() Line 81	C++
 	test-output-pgsql-validgeom.exe!`anonymous namespace'::run_test(const char * test_name, void (void) * testfunc) Line 36	C++
 	test-output-pgsql-validgeom.exe!main(int argc, char * * argv) Line 96	C++
 	[External Code]	
```

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