obstack_init(&chordal_env.obst);
+ /* add Keeps for should_be_different constrained nodes */
+ lower_nodes_before_ra(&chordal_env);
+
/* Perform the following for each register class. */
for(j = 0, m = arch_isa_get_n_reg_class(isa); j < m; ++j) {
chordal_env.cls = arch_isa_get_reg_class(isa, j);