RFR: ClassLoadStatsClosure uses naked oop comparison

[Zhengyu Gu]

This is an upstream bug, will file a bug. It broke VerifyJCStressTest on 
my machine.


http://cr.openjdk.java.net/~zgu/shenandoah/cld_stats_oop_equals/webrev.00/

Test:

   tier3_gc_shenandoah (fastdebug and release)

Thanks,

-Zhengyu