8154064: JVMTI trace event crashes

Reviewed-by: sla, stefank
diff --git a/hotspot/src/share/vm/prims/jvmtiExport.cpp b/hotspot/src/share/vm/prims/jvmtiExport.cpp
index 20de3f9..edaea32 100644
--- a/hotspot/src/share/vm/prims/jvmtiExport.cpp
+++ b/hotspot/src/share/vm/prims/jvmtiExport.cpp
@@ -2260,7 +2260,7 @@
     if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
       EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("JVMTI [%s] Evt vmobject alloc sent %s",
                                          JvmtiTrace::safe_get_thread_name(thread),
-                                         object==NULL? "NULL" : java_lang_Class::as_Klass(object)->external_name()));
+                                         object==NULL? "NULL" : object->klass()->external_name()));
 
       JvmtiVMObjectAllocEventMark jem(thread, h());
       JvmtiJavaThreadEventTransition jet(thread);