RFR(XS): 8027965: Adapt PPC to 8015107: NPG: Use consistent naming for metaspace concepts

[Lindenmaier, Goetz]

Hi,

Please review this change.  It's really small, ppc only and required by the last
update of the ppc staging repository.

http://cr.openjdk.java.net/~goetz/webrevs/8027965/

Best regards,
  Goetz Lindenmaier