RFR (XXS): 820935: PPC64: fix build with -Wreorder introduced with 8208672

[Haug, Gunter]

Hi all,

-Wreorder introduced with 8208672 required a few changes in PPC64 platform files to fix the build. Can I please have a review and a sponsor for the following change:

https://bugs.openjdk.java.net/projects/JDK/issues/JDK-8209357?filter=reportedbyme
http://cr.openjdk.java.net/~ghaug/webrevs/820935/

Thanks a lot and have a nice weekend,
Gunter