RFR: Use oopDesc::mark_offset_in_bytes() instead of 0 for addressing mark word

[Andrew Haley]

On 13/10/16 09:08, Roman Kennke wrote:
> This is not strictly a shenandoah specific patch, but I need it in our
> repos for upcoming patches. Not sure if it's useful to propose upstream
> at this point in jdk9 dev?

I don't think it is at all a good idea to change any code which is
not strictly required by Shenandoah.  The lock word as the first word
of an object is a basic assumption.  Any non-Shenandoah changes should
go upstream first.

Andrew.