RFR(XS): 8162869: Small fixes for AIX perf memory and attach listener

[Langer, Christoph]

Hi,

please review a very small fix in the AIX perf memory and the AIX attach listener:
Bug: https://bugs.openjdk.java.net/browse/JDK-8162869
Change: http://cr.openjdk.java.net/~clanger/webrevs/8162869.1/

I also touched the perfMemory_*.cpp files of the other platforms to align indentation and some comments. Because of that I also need a sponsor to push the change.

Thanks in advance and best regards,
Christoph