RFR: 8223767: Shenandoah fails to build on Solaris x86_64

[Roman Kennke]

> Please review a set of simple changes to satisfy Oracle Solaris Studio
> 12.4 which complains about last comma in enums, private access specifier
> for the given enum used outside, and finds names conflict between
> function parameter and struct field names.
> 
> http://bugs.openjdk.java.net/browse/JDK-8223767
> http://cr.openjdk.java.net/~bulasevich/8223767/webrev.00
> 
> With the given change release and fastdebug builds are Ok, and
> hotspot_gc_shenandoah tests works good.

Looks good to me! Thank you!!
Roman