Fix T40297: Crash while ripping an edge when autosmooth is activated.

Turned out there was still quite a few cases were indices were set dirty,
but elem_index_dirty was not tagged accordingly (mostly for BM_LOOP,
but a few others as well). So probably this crash was not the only one
hidden here.

Hopefully all possible cases were catched this time!

source/blender/bmesh/tools/bmesh_wireframe.c

@@ -334,7 +334,7 @@ void BM_mesh_wireframe(
 		}
 
 		BM_ITER_ELEM (l, &itersub, f_src, BM_LOOPS_OF_FACE) {
-			BM_elem_index_set(l, verts_loop_tot); /* set_loop */
+			BM_elem_index_set(l, verts_loop_tot); /* set_dirty */  /* Because some faces might be skipped! */
 
 			BM_loop_calc_face_tangent(l, tvec);
 
@@ -407,6 +407,7 @@ void BM_mesh_wireframe(
 			verts_loop_tot++;
 		}
 	}
+	bm->elem_index_dirty |= BM_LOOP;
 
 	BM_ITER_MESH (f_src, &iter, bm, BM_FACES_OF_MESH) {