RFR(xs): 8187028: [aix] Real thread stack size may be up to 64K smaller than requested one

[Thomas Stüfe]

Hi all,

please review this change:

Bug:
https://bugs.openjdk.java.net/browse/JDK-8187028

change:
http://cr.openjdk.java.net/~stuefe/webrevs/8187028-aix-Real-thread-stack-size-may-be-up-to-64K-smaller-than-requested-one/webrev.00/webrev/

The issue is that on AIX, pthread library seems to have a bug where it
sometimes gives us less thread stack space than we requested (a variable
amount, but seems to be 0..64K). This may cause intermittent stack overflow
errors if the stacks are very small to begin with.

The workaround is to add 64K to the requested stack size to account for the
fact that the OS may give us up to 64K less stack.

Also, improved logging.

Thanks, Thomas
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