diff -r dc3aa11c6da7 -r acc2744fd84b hotspot/src/share/vm/gc/shared/referenceProcessor.cpp
--- a/hotspot/src/share/vm/gc/shared/referenceProcessor.cpp	Tue Sep 15 15:49:33 2015 +0200
+++ b/hotspot/src/share/vm/gc/shared/referenceProcessor.cpp	Wed Sep 16 16:25:02 2015 +0200
@@ -243,13 +243,10 @@
       process_discovered_reflist(_discoveredPhantomRefs, NULL, false,
                                  is_alive, keep_alive, complete_gc, task_executor);
 
-  }
-
-  // Cleaners
-  size_t cleaner_count = 0;
-  {
-    GCTraceTime tt("Cleaners", trace_time, false, gc_timer, gc_id);
-    cleaner_count =
+    // Process cleaners, but include them in phantom statistics.  We expect
+    // 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, true,
                                  is_alive, keep_alive, complete_gc, task_executor);
   }
@@ -259,17 +256,15 @@
   // that is not how the JDK1.2 specification is. See #4126360. Native code can
   // thus use JNI weak references to circumvent the phantom references and
   // resurrect a "post-mortem" object.
-  size_t jni_weak_ref_count = 0;
   {
     GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer, gc_id);
     if (task_executor != NULL) {
       task_executor->set_single_threaded_mode();
     }
-    jni_weak_ref_count =
-      process_phaseJNI(is_alive, keep_alive, complete_gc);
+    process_phaseJNI(is_alive, keep_alive, complete_gc);
   }
 
-  return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count, cleaner_count, jni_weak_ref_count);
+  return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count);
 }
 
 #ifndef PRODUCT
@@ -296,17 +291,17 @@
 }
 #endif
 
-size_t ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive,
-                                            OopClosure*        keep_alive,
-                                            VoidClosure*       complete_gc) {
-  DEBUG_ONLY(size_t check_count = count_jni_refs();)
-  size_t count = JNIHandles::weak_oops_do(is_alive, keep_alive);
-  assert(count == check_count, "Counts didn't match");
+void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive,
+                                          OopClosure*        keep_alive,
+                                          VoidClosure*       complete_gc) {
+#ifndef PRODUCT
+  if (PrintGCDetails && PrintReferenceGC) {
+    unsigned int count = count_jni_refs();
+    gclog_or_tty->print(", %u refs", count);
+  }
+#endif
+  JNIHandles::weak_oops_do(is_alive, keep_alive);
   complete_gc->do_void();
-  if (PrintGCDetails && PrintReferenceGC) {
-    gclog_or_tty->print(", " SIZE_FORMAT " refs", count);
-  }
-  return count;
 }
 
 
@@ -946,10 +941,9 @@
       list = &_discoveredCleanerRefs[id];
       break;
     case REF_NONE:
-    case REF_JNI:
       // we should not reach here if we are an InstanceRefKlass
     default:
-      guarantee(false, err_msg("rt should not be %d", rt));
+      ShouldNotReachHere();
   }
   if (TraceReferenceGC && PrintGCDetails) {
     gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, p2i(list));