RFR: JDK-8211270: GC abstraction to get real object and headers size

[Roman Kennke]

Duh.

Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8211270/webrev.00/

Thanks,
Roman

Am 28.09.18 um 12:11 schrieb Roman Kennke:
> Shenandoah GC uses one extra word per object. Some places need to know
> the real object or header size (fwd ptr plus object).
> 
> The affected code paths are WB_GetObjectSize(),
> JvmtiEnv::GetObjectSize() and the PLAB constructor. The patch also adds
> an assert later in PLAB that uses the header_size().
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8211270
> Webrev:
> file:///home/rkennke/src/openjdk/webrev/JDK-8211270/webrev.00/
> 
> Can I please get reviews?
> 
> Thanks,
> Roman
> 

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