8071931: Return of the phantom menace

Reviewed-by: mchung, dfuchs, ahgross, brutisso

src/share/vm/memory/referenceProcessor.cpp

@@ -252,7 +252,7 @@ ReferenceProcessorStats ReferenceProcessor::process_discovered_references(
     // Cleaner references to be temporary, and don't want to deal with
     // possible incompatibilities arising from making it more visible.
     phantom_count +=
-      process_discovered_reflist(_discoveredCleanerRefs, NULL, false,
+      process_discovered_reflist(_discoveredCleanerRefs, NULL, true,
                                  is_alive, keep_alive, complete_gc, task_executor);
   }