S code review please: 6763959 LockSupport.parkUntil(0)

[Karen Kinnear]

Please review:

http://cr.openjdk.java.net/~acorn/6763959/webrev/
bug link at http://monaco.sfbay.sun.com/detail.jsf?cr=6763959

6763959: java.util.concurrent.locks.LockSupport.parkUntil(0) blocks  
forever instead of returning immediately.
Thanks to David Holmes for the suggested fixes.

tests: new test attached to bug
on Solaris, Linux and Windows

thanks,
Karen