use `rb_hash_new_compare_by_id()`.

* vm_eval.c (local_var_list_init): use `rb_hash_new_compare_by_id()`
  directly instead of manipulating st_table.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65433 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_eval.c

@@ -2009,8 +2009,7 @@ rb_catch_obj(VALUE t, VALUE (*func)(), VALUE data)
 static void
 local_var_list_init(struct local_var_list *vars)
 {
-    vars->tbl = rb_hash_new();
-    RHASH(vars->tbl)->ntbl = st_init_numtable(); /* compare_by_identity */
+    vars->tbl = rb_hash_new_compare_by_id();
     RBASIC_CLEAR_CLASS(vars->tbl);
 }