RFR (S) 8217014: Epsilon should not ignore Metadata GC causes

[Zhengyu Gu]

Hi Aleksey,

> 
> Got an external comment: since we are changing the end-of-run message, it makes sense be to able to
> print sizes in K, not in M. The simple addendum is to use proper_unit infra for heap/metadata
> occupancy messages.
> 
> Hopefully final webrev:
>    http://cr.openjdk.java.net/~shade/8217014/webrev.03/

MetaspaceGC::compute_new_size() seems to be called for every GC cycle, 
not just metaspace inducted GC cycle, in other GCs.

Otherwise, looks good.

Thanks,

-Zhengyu

> 
> Thanks,
> -Aleksey
>