Allocates memory for the node info list upfront.

Turns out we were not doing this. Huh.

Callstack:
- 78583d2c8c/include/util/graph_loader.hpp (L65-L68)
- 538bbd47d1/src/extractor/extractor.cpp (L423-L424)
- 78583d2c8c/src/extractor/extractor.cpp (L465-L466)
- 78583d2c8c/src/extractor/extractor.cpp (L254-L261)

include/util/graph_loader.hpp

@@ -81,6 +81,8 @@ NodeID loadNodesFromFile(std::istream &input_stream,
     input_stream.read(reinterpret_cast<char *>(&n), sizeof(NodeID));
     SimpleLogger().Write() << "Importing n = " << n << " nodes ";
 
+    node_array.reserve(n);
+
     extractor::ExternalMemoryNode current_node;
     for (NodeID i = 0; i < n; ++i)
     {