P4
The change in ObjectSampleMarker, a part of JFR, is incorrect when Lilliput is off. It would reach to `set_narrow_klass` and `narrow_klass` unconditionally, but that is only safe to do when `UseCompactObjectHeader` is on.
This would be caught by assert in `set_narrow_klass` and `narrow_klass` with `-UCOH`. AFAICS, this has a chance to corrupt the header in release bits, as it would copy only the parts of the mark word, and we might be just lucky those are the same bits.
This would be caught by assert in `set_narrow_klass` and `narrow_klass` with `-UCOH`. AFAICS, this has a chance to corrupt the header in release bits, as it would copy only the parts of the mark word, and we might be just lucky those are the same bits.
