When run without the JIT, TestAESMain.java has been observed taking 6-8 hours to run. Normally this is not a problem; just run it with the JIT turned on.

However, on a linux distro for the s390 architecture (referred to here as zLinux), JDK8 has no JIT, and therefore cannot be run in under 6 hours.

I propose a basic fix that reduces the runtime of the test on this platform without requiring us to exclude it entirely.

Webrev Link: http://cr.openjdk.java.net/~afarley/8264114.1/webrev/