move propagated_var_nums insertion to proper scope (#2183)

src/codegen.rs

@@ -85,11 +85,11 @@ impl BranchCodeStack {
 
                             self.stack[idx][branch_idx].push_back(instr!("put_variable", r, 0));
                         }
+                    }
 
                     if idx > self.stack.len() - depth {
                         propagated_var_nums.insert(var_num);
                     }
-                    }
 
                     subsumed_hits.insert(var_num);
                 }