JDK-8031755 introduced a "return n" in GraphKit::record_profiled_receiver_for_speculation() which is never executed and an assignment to 'maybe_null' that has no effect:
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/37023a7f1e1b#l7.99

+ bool maybe_null = true;
+ if (java_bc() == Bytecodes::_checkcast ||
+ java_bc() == Bytecodes::_instanceof ||
+ java_bc() == Bytecodes::_aastore) {
+ ciProfileData* data = method()->method_data()->bci_to_data(bci());
+ bool maybe_null = data == NULL ? true : data->as_BitData()->null_seen();
+ }
+ return record_profile_for_speculation(n, exact_kls, maybe_null);
+ return n;