RFR(L): 8143125: [aix] Further Developments for AIX

[Thomas Stüfe]

Hi all,

please review and sponsor these AIX only changes. Basically, with this
change we bring the OpenJDK AIX hotspot port up to speed with the
developments done at SAP in the recent months.

For a more detailled number of changes and fixes, please refer to the bug
description.

Bug: https://bugs.openjdk.java.net/browse/JDK-8143125
webrev:
http://cr.openjdk.java.net/~stuefe/webrevs/8143125-Further/webrev.00/webrev/index.html

Kind Regards, Thomas