RFR: 8223767: Shenandoah fails to build on Solaris x86_64

[Boris Ulasevich]

Hi all,

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.

thanks,
Boris