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

[Guoxiong Li]

Hi all,

I noticed the `XMark::follow_object` invokes the
`ContinuationGCSupport::relativize_stack_chunk` to transform the pointer.
But `ZMark::follow_object` only checks if the object is a stack chunk
by using `oopDesc::is_stackChunk`.

And the `XBarrierSetStackChunk::encode_gc_mode` is an empty implementation.
Does the `XMark::follow_object` need to invoke
`ContinuationGCSupport::relativize_stack_chunk`?
Or is it just unrelated code which needs to be adjusted?


Best Regards,
-- Guoxiong
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