RFR (S): 8223693: Memory wastage in size of per-region type buffers in GC

[Kim Barrett]

> On May 24, 2019, at 8:25 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>  can I have reviews for this small change in the constants for
> G1HeapRegionAttr::_type field, eliminating some confusion and minor
> memory wastage?
> 
> Perf testing showed no measurable impact of the change.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8223693
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8223693/webrev/
> Testing:
> hs-tier1-5 in conjunction with other changes; perf testing showed no
> measurable impact
> 
> Thanks,
>  Thomas

Looks good.