estates_equiv
if (estates_equiv(s1, s2))
if (estate_rl(left_true_state) && estates_equiv(left_true_state, left_false_state)) {
if (estate_rl(right_true_state) && estates_equiv(right_true_state, right_false_state)) {
int estates_equiv(struct smatch_state *one, struct smatch_state *two);