RFR: Verifier should check klass pointers before attempting to reach for object size

[Roman Kennke]

Am 14.12.2017 um 10:52 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/verifier-klass-checks/webrev.01/
> 
> Debug a new feature -> corrupt the heap -> crash the Verifier. Verifier should be more resilient
> when Klass pointers are NULL, in which case oopDesc::size() is guaranteed to fail.
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks,
> -Aleksey
> 

Very good. Go!