RFR (S) 8231667: Shenandoah: Full GC should take empty regions into slices for compaction

[Roman Kennke]

Ok.

Thanks,
Roman

> Bug:
>   https://bugs.openjdk.java.net/browse/JDK-8231667
> 
> Fix:
>   https://cr.openjdk.java.net/~shade/8231667/wevrev.01/
> 
> There is a problem with current Full GC that makes some tests fail with OOME unnecessarily. See
> details in the bug report.
> 
> Testing: {x86_64, x86_32} hotspot_gc_shenandoah, affected tests
>