JDK 9 RFR of JDK-8080658: Update FindDecoderBugs.java to use random number generator library

[joe darcy]

On 5/19/2015 8:42 AM, Martin Buchholz wrote:
> Thanks.
>
> We believe there is a bug in the JDK revealed by FindDecoderBugs - so
> actually find that bug and provide a repro recipe!

Yes, the random number library in the jtreg directory prints out the 
seed used, which should make reproducing the failure much easier :-)

-Joe