Revision 277122

First attempt at optimizing the zip code to have decent performance
The performance problem was mainly due to the entry insertion in
the hashtable where all hash code were equals in the hashtable.
I also removed a lot of unecessary Zip(Long|Short) object creation by
adding static methods and suppressed a hashtable. 

More can be done, but I tried not to break the interface and have as less code
as possible. The testcase attached in the bug report show that it is now 15% slower than Sun native code and 20% faster than Jazz libs.

Now watch for Gump...

PR: 31930