Fix check in cc_is_active

rb_vm_empty_cc_for_super() is always true, so this previously always
returned false.

Author: jhawthorn

iseq.c

@@ -343,7 +343,7 @@ static bool
 cc_is_active(const struct rb_callcache *cc, bool reference_updating)
 {
     if (cc) {
-        if (cc == rb_vm_empty_cc() || rb_vm_empty_cc_for_super()) {
+        if (cc == rb_vm_empty_cc() || cc == rb_vm_empty_cc_for_super()) {
             return false;
         }