RFR (M) 8232102: Shenandoah: print everything in proper units

[Roman Kennke]

Looks good! Thanks!

Roman


> RFE:
>   https://bugs.openjdk.java.net/browse/JDK-8232102
> 
> Shenandoah is used on smaller heaps as well as large ones. There, the default unit of "M" makes the
> logs too coarse and lose information. We have already fixed up some of the uses where it is
> critical. This issue handles the rest of the cases. This makes more sense after JDK-8217315 is
> fixed. Note the GC timings/heap-sizes themselves are handled by shared code, see JDK-8232100.
> 
> Fix:
>   https://cr.openjdk.java.net/~shade/8232102/webrev.01/
> 
> Testing: hotspot_gc_shenandoah {fastdebug, release}, eyeballing gc logs
>