Review request: Reduce size of Collisions.java test run

[Mike Duigou]

Hello All;

A very small patch to the Collisions.java regression test which reduces the size of the test by 50% in the default case. We've run into problems with this test taking too long on small or older platforms.

http://cr.openjdk.java.net/~mduigou/7189926/0/webrev/

Thanks,

Mike