The removed function call removes all attributes from mesh edges
and rebuilds the mesh edge topology. This isn't necessary because
meshes always have edges in the first place.
Exporting a 4 million face grid, this saved 1.5 seconds out of 4
seconds total for the whole export.
Tests files have to be updated, since the edge calculation could
potentially change the order of elements. This is also a fix, since
previously the exporter would delete all attributes on the evaluated
mesh edges.
Differential Revision: https://developer.blender.org/D16391
455d195d55