RFR (S) 8245726: Shenandoah: lift/cleanup ShenandoahHeuristics names and properties

[Roman Kennke]

Looks good!

Thanks,
Roman

On Mon, 2020-05-25 at 15:13 +0200, Aleksey Shipilev wrote:
> RFE:
>   https://bugs.openjdk.java.net/browse/JDK-8245726
> 
> JDK-8245720 would print most stuff in Capitalized Form. GC modes
> already print in capitalized form.
> Heuristics should do the same. Additionally, lifting the
> is_diagnostic/is_experimental
> implementations right into header makes it a bit more clean, and
> matches what modes are doing.
> 
> Webrev:
>   https://cr.openjdk.java.net/~shade/8245726/webrev.01/
> 
> Testing: hotspot_gc_shenandoah
>