RFR (S): 8196602: Change HeapRegionClosure to comply to naming conventions

[Kim Barrett]

> On Feb 7, 2018, at 4:16 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>  can I have reviews for this small change that updates
> HeapRegionClosure to comply to the new (actually quite old) Hotspot
> naming convention, in particular no camelCase.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8196602
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8196602/webrev/
> Testing:
> local compilation, grepping through sources for method names
> 
> Thanks,
>  Thomas

Looks good.