RFR: JDK-8199735: Mark word updates need to use Access API

[Roman Kennke]

Am 19.03.2018 um 11:40 schrieb Roman Kennke:
> Currently, the mark word is accessed directly in oopDesc::mark()
> set_mark() and a bunch of other accessors. Those need to use the Access
> API instead because GC might want to employ barriers on those accesses,
> pretty much like every other field in oopDesc.
> 
> Notice that this is *not* about accessing the bits and fields inside the
> markOop, but about accessing the header itself.
> 
> http://cr.openjdk.java.net/~rkennke/JDK-8199735/webrev.01/
> 
> Testing: build fastdebug/release with and without PCH, passed tier1
> fastdebug/release.
> 
> Can I please get reviews?
> 
> Thanks, Roman
> 

Just when I sent it, I realized that this is dropping the volatile from
the mark word access. Fixed here:


http://cr.openjdk.java.net/~rkennke/JDK-8199735/webrev.02/

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