minor speedup for DM_to_bmesh_ex(), only duplicate the edge array when the derivedMesh type isn't a CDDM.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53716 954f8c5b-7b00-dc11-b283-0030488c597c
speedup for DM_to_bmesh_ex(), no need to check vertex order when converting faces since the loops are already in order, will speedup modifiers that use bmesh.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53717 954f8c5b-7b00-dc11-b283-0030488c597c