fix: use zip() for safer Option handling in assignment expression CFG

Author: camc314

crates/oxc_semantic/src/builder.rs

@@ -975,8 +975,10 @@ impl<'a> Visit<'a> for SemanticBuilder<'a> {
                 let expr_end_ix = cfg.current_node_ix;
                 let after_assignment_ix = cfg.new_basic_block_normal();
 
-                if let Some(before_ix) = before_assignment_graph_ix {
-                    cfg.add_edge(before_ix, start_of_condition_graph_ix.unwrap(), EdgeType::Normal);
+                if let Some((before_ix, condition_ix)) =
+                    before_assignment_graph_ix.zip(start_of_condition_graph_ix)
+                {
+                    cfg.add_edge(before_ix, condition_ix, EdgeType::Normal);
                 }
                 cfg.add_edge(target_end_ix, expr_start_ix, EdgeType::Normal);
                 cfg.add_edge(target_end_ix, after_assignment_ix, EdgeType::Normal);