Patch for building Java8 JDK repository

[Jonathan Lu]

Hello,

I've got a patch to build Java8 JDK repository [1] on AIX 64 and Linux 
PPC 64, and plan to push it to  [1], before that I'd like to get some 
comments here :)

The patch includes two parts,
I) Patches ported from PPC Java7u repository [3], which includes various 
changes from 'corba' and 'jdk' repositories.
II) Several small new changes to make the compilation pass.
http://cr.openjdk.java.net/~luchsh/ppc-port-bringup-java8/

Since the HotSpot patches have not yet been ported to Java8, so I was 
using OpenJDK7 builds [2] provided by Volker as bootstrapping JDK and 
use JDK7 HotSpot as alternative import. So in part II) patch there's a 
workaround for non-existing VM interface.

Many thanks
- Jonathan

[1] http://hg.openjdk.java.net/ppc-aix-port/jdk8/jdk
[2] http://cr.openjdk.java.net/~simonis/ppc-aix-port/bootstrap/
[3] http://hg.openjdk.java.net/ppc-aix-port/jdk7u