bel.ws = new_workset(&bel.ob, &bel);
bel.uses = be_begin_uses(chordal_env->irg, chordal_env->birg->main_env->arch_env, bel.cls);
bel.senv = be_new_spill_env(chordal_env, is_mem_phi, NULL);
bel.ws = new_workset(&bel.ob, &bel);
bel.uses = be_begin_uses(chordal_env->irg, chordal_env->birg->main_env->arch_env, bel.cls);
bel.senv = be_new_spill_env(chordal_env, is_mem_phi, NULL);