The difference between `XMark::follow_object` and `ZMark::follow_object`

[Guoxiong Li]

Hi Stefan,

Thanks for your answer.

> it might be nice to change it to make the code
> more consistent. However, note that you need to perform significant
> amount of testing before such a change will be integrated.

I am glad to provide a patch to polish it. Filed
https://bugs.openjdk.org/browse/JDK-8328779 .
But currently, my local environment can't run too many long-time tests.
Could I please get your or others' help to run some related tests based on
my PR?

Best Regards,
-- Guoxiong
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