ifdef should be if

src/hotspot/share/opto/runtime.cpp:2006:41: error: ‘make_notify_jvmti_vthread_Type’ was not declared in this scope; did you mean ‘_notify_jvmti_vthread_Type’?
 2006 | _notify_jvmti_vthread_Type = make_notify_jvmti_vthread_Type();