Make it possible to disable read barriers in Class::GetObjectSize()

This is a leftover from cl/91831 (commit
9103c86a98524e9ddfd14f8cee56e919f68eee9b) that attempted to make it
possible to disable read barriers in Object::SizeOf().

Bug: 12687968
Change-Id: I2b05076832936881ec61bc21b6eb6b7c04e0a1f0
diff --git a/runtime/mirror/object-inl.h b/runtime/mirror/object-inl.h
index 064fe30..a2072a2 100644
--- a/runtime/mirror/object-inl.h
+++ b/runtime/mirror/object-inl.h
@@ -389,7 +389,8 @@
     result = AsClass<kNewFlags, kReadBarrierOption>()->
         template SizeOf<kNewFlags, kReadBarrierOption>();
   } else {
-    result = GetClass<kNewFlags, kReadBarrierOption>()->GetObjectSize();
+    result = GetClass<kNewFlags, kReadBarrierOption>()->
+        template GetObjectSize<kNewFlags, kReadBarrierOption>();
   }
   DCHECK_GE(result, sizeof(Object))
       << " class=" << PrettyTypeOf(GetClass<kNewFlags, kReadBarrierOption>());