mruby-compiler: remove traditional word/symbol array codegen paths

Remove unused codegen_words and codegen_symbols functions along with their
corresponding cases in the main codegen switch. These became dead code
after converting new_words and new_symbols to always use variable-sized nodes.

Also remove var_nodes_enabled conditions from new_words and new_symbols,
completing the transition to always using variable-sized nodes for word and
symbol arrays.

Co-authored-by: Claude <noreply@anthropic.com>

mrbgems/mruby-compiler/core/codegen.c

@@ -4314,17 +4314,7 @@ codegen_xstr(codegen_scope *s, node *tree, int val)
   if (val) push();
 }
 
-static void
-codegen_words(codegen_scope *s, node *tree, int val)
-{
-  gen_literal_array(s, tree, FALSE, val);
-}
 
-static void
-codegen_symbols(codegen_scope *s, node *tree, int val)
-{
-  gen_literal_array(s, tree, TRUE, val);
-}
 
 /* codegen_cons_list_string forward declaration moved to top of file */
 
@@ -5976,22 +5966,14 @@ static void
 gen_words_var(codegen_scope *s, node *varnode, int val)
 {
   struct mrb_ast_words_node *n = words_node(varnode);
-  // Create stack-allocated node structure for traditional codegen
-  struct mrb_ast_head_node stack_node = {0};
-  stack_node.car = (node*)NODE_WORDS;
-  stack_node.cdr = n->args;
-  codegen_words(s, (node*)&stack_node, val);
+  gen_literal_array(s, n->args, FALSE, val);
 }
 
 static void
 gen_symbols_var(codegen_scope *s, node *varnode, int val)
 {
   struct mrb_ast_symbols_node *n = symbols_node(varnode);
-  // Create stack-allocated node structure for traditional codegen
-  struct mrb_ast_head_node stack_node = {0};
-  stack_node.car = (node*)NODE_SYMBOLS;
-  stack_node.cdr = n->args;
-  codegen_symbols(s, (node*)&stack_node, val);
+  gen_literal_array(s, n->args, TRUE, val);
 }
 
 
@@ -6681,13 +6663,6 @@ codegen(codegen_scope *s, node *tree, int val)
     codegen_heredoc_str(s, tree, val);
     break;
 
-  case NODE_WORDS:
-    codegen_words(s, tree, val);
-    break;
-
-  case NODE_SYMBOLS:
-    codegen_symbols(s, tree, val);
-    break;
 
   case NODE_XSTR:
     codegen_xstr(s, tree, val);

mrbgems/mruby-compiler/core/parse.y

@@ -2300,10 +2300,6 @@ new_str_empty(parser_state *p)
 static node*
 new_words(parser_state *p, node *a)
 {
-  if (!p->var_nodes_enabled) {
-    return cons_head((node*)NODE_WORDS, a);
-  }
-
   size_t total_size = sizeof(struct mrb_ast_words_node);
   enum mrb_ast_size_class class = size_to_class(total_size);
   struct mrb_ast_words_node *words_node = (struct mrb_ast_words_node*)parser_alloc_var(p, total_size, class);
@@ -2316,10 +2312,6 @@ new_words(parser_state *p, node *a)
 static node*
 new_symbols(parser_state *p, node *a)
 {
-  if (!p->var_nodes_enabled) {
-    return cons_head((node*)NODE_SYMBOLS, a);
-  }
-
   size_t total_size = sizeof(struct mrb_ast_symbols_node);
   enum mrb_ast_size_class class = size_to_class(total_size);
   struct mrb_ast_symbols_node *symbols_node = (struct mrb_ast_symbols_node*)parser_alloc_var(p, total_size, class);