message: Fix constant maintain
diff: @@ -389,6 +389,9 @@ impl<T: SSA + SSAMod + Clone> Analyzer<T> {
  pub fn emit_ssa(&mut self) -> T {
  for (k, v) in &self.expr_val {
  + if self.g.get_const(k).is_some() {
  + continue;
  + }
  if let LatticeValue::Const(val) = *v {
  radeco_trace!("{:?} with {:?} --> Const {:#}",
  k, self.g.get_node_data(k), val);
  