RFR: AIX: fixes and improvements for the new HS build

[Volker Simonis]

Hi,

I'd like to suggest the following fixes and improvements for the new
HS build on AIX:

http://cr.openjdk.java.net/~simonis/webrevs/2016/AIX_new_hs_build_top_level/
http://cr.openjdk.java.net/~simonis/webrevs/2016/AIX_new_hs_build_hotspot/

The changes shouldn't affect any other platform. I've rebased them to
the build-infra state of today afternoon.

The changes require the re-generation of generated-configure.sh so I'm
not sure if I should push this or if you want to sponsor the change.

I'd like to express my thankfulness once again for the great work
you've already put into supporting AIX and ppc64.

Regards,
Volker