RFR: 8172964: [aix] AIX VM should not handle SIGDANGER

[Thomas Stüfe]

Dear all,

please review this bugfix for AIX.

Issue
https://bugs.openjdk.java.net/browse/JDK-8172964
Webrev:
http://cr.openjdk.java.net/~stuefe/webrevs/8172964-AIX-SIGDANGER/webrev/

In short, this removes the handling for SIGDANGER from the hotspot.
Handling SIGDANGER has almost no benefit for us but interferes with AIX OOM
killing mechanism, making effects of ow-paging-space situations on AIX more
severe than they would need to be.

For more details, please see the bug report.

Thanks & Kind Regards,

Thomas