vm_insinhelper.c: prefer using inlinable function

No major performance impact, but just in case for some platform
that matters.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65062 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_insnhelper.c

@@ -1013,7 +1013,7 @@ static inline VALUE
 vm_setivar(VALUE obj, ID id, VALUE val, IC ic, struct rb_call_cache *cc, int is_attr)
 {
 #if USE_IC_FOR_IVAR
-    rb_check_frozen(obj);
+    rb_check_frozen_internal(obj);
 
     if (LIKELY(RB_TYPE_P(obj, T_OBJECT))) {
 	VALUE klass = RBASIC(obj)->klass;