RFR: Multiple cleanups

[Roman Kennke]

Good to me. Thanks!
Roman

> http://cr.openjdk.java.net/~shade/shenandoah/cleanups-10/webrev.01/
> 
> -1% of source code :)
> 
> Includes three changesets:
>  - Remove dead-weight ShenandoahPrinter (from the last changeset)
>  - Rehash and cleanup usages of ShenandoahHeap::heap()
>  - Cleanup up superfluous newlines
>  - Cleanup C2 debugging leftovers
> 
> Testing: tier3_gc_shenandoah
> 
> Thanks,
> -Aleksey
> 
>