RFR (S): Refactor BrooksPointer utility class

[Roman Kennke]

Looks good to me!
Roman

Am Freitag, den 07.10.2016, 19:15 +0200 schrieb Aleksey Shipilev:
> Hi,
> 
> When I was doing the fwdptr experiments, new asserts in BrooksPointer
> helped to diagnose bugs. Also, the API is unfortunate in the way it
> provides levity for doing fwdptr transitions we don't want. This is
> the
> cleanup:
>  http://cr.openjdk.java.net/~shade/shenandoah/brooks-asserts/webrev.0
> 1/
> 
> Testing: {fastdebug,release} hotspot_gc_shenandoah, jcstress
> tests-custom -m quick (in progress)
> 
> Thanks,
> -Aleksey
> 
>