RFR(L): 8049716: PPC64: Implement SA on Linux/PPC64

[Volker Simonis]

Hi,

I'd like to submit this webrev which adds support for the SA agent on
Linux/PPC64 on behalf of Maynard Johnson who is the main author of the
change:

http://cr.openjdk.java.net/~simonis/webrevs/8049716
https://bugs.openjdk.java.net/browse/JDK-8049716

I have already reviewed and tested the change and from my side
everything looks fine.

The change touches quite some shared code but all of these changes are
trivial and straight-forward (i.e. they just add Linux/PPC64 support
with the help of '#ifdef's in C or yet another 'elseif' clause in
Java).

We need a second reviewer and a sponsor who can push this to the
hotspot repository once the review is completed.

Thank you and best regards,
Volker