Remove use of symbols and arrays when freeing global table

This removes the use of symbol and array objects when freeing the global
table so we can now free symbols and arrays earlier.

gc.c

@@ -4316,13 +4316,8 @@ rb_objspace_free_objects_i(VALUE obj, void *data)
 {
     rb_objspace_t *objspace = (rb_objspace_t *)data;
 
-    switch (BUILTIN_TYPE(obj)) {
-      case T_NONE:
-      case T_SYMBOL:
-        break;
-      default:
+    if (BUILTIN_TYPE(obj) != T_NONE) {
         obj_free(objspace, obj);
-        break;
     }
 }
 
@@ -4350,8 +4345,6 @@ rb_objspace_call_finalizer_i(VALUE obj, void *data)
       case T_FILE:
         obj_free(objspace, obj);
         break;
-      case T_SYMBOL:
-      case T_ARRAY:
       case T_NONE:
         break;
       default:

variable.c

@@ -451,7 +451,7 @@ struct rb_global_entry {
 };
 
 static enum rb_id_table_iterator_result
-free_global_entry_i(ID key, VALUE val, void *arg)
+free_global_entry_i(VALUE val, void *arg)
 {
     struct rb_global_entry *entry = (struct rb_global_entry *)val;
     if (entry->var->counter == 1) {
@@ -467,7 +467,7 @@ free_global_entry_i(ID key, VALUE val, void *arg)
 void
 rb_free_rb_global_tbl(void)
 {
-    rb_id_table_foreach(rb_global_tbl, free_global_entry_i, 0);
+    rb_id_table_foreach_values(rb_global_tbl, free_global_entry_i, 0);
     rb_id_table_free(rb_global_tbl);
 }