Always visit object class from VisitReferences

We don't want to unload classes which have instances.

Slight increase in CMS GC time from ~6.5s to ~7.3s on
EvaluateAndApplyChanges.

Bug: 22720414
Change-Id: I467ff9c9d55163d2a90b999aef3bdd7b3f648bac
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index e56351f..d7f918b 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -1795,7 +1795,7 @@
   // TODO: Fix lock analysis to not use NO_THREAD_SAFETY_ANALYSIS, requires support for
   // annotalysis on visitors.
   void operator()(mirror::Object* o) const NO_THREAD_SAFETY_ANALYSIS {
-    o->VisitReferences<true>(*this, VoidFunctor());
+    o->VisitReferences(*this, VoidFunctor());
   }
 
   // For Object::VisitReferences.
@@ -2788,7 +2788,7 @@
     // be live or else how did we find it in the live bitmap?
     VerifyReferenceVisitor visitor(heap_, fail_count_, verify_referent_);
     // The class doesn't count as a reference but we should verify it anyways.
-    obj->VisitReferences<true>(visitor, visitor);
+    obj->VisitReferences(visitor, visitor);
   }
 
   static void VisitCallback(mirror::Object* obj, void* arg)
@@ -2969,7 +2969,7 @@
   void operator()(mirror::Object* obj) const
       SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) {
     VerifyReferenceCardVisitor visitor(heap_, const_cast<bool*>(&failed_));
-    obj->VisitReferences<true>(visitor, VoidFunctor());
+    obj->VisitReferences(visitor, VoidFunctor());
   }
 
   bool Failed() const {