request for review (m) - 6858496

[Jon Masamitsu]

Fixed 6858496: Clear all SoftReferences before an out-of-memory due to
GC overhead limit.

Also did some tuning of the policy for out-of-memory due to GC overhead to
make it more restrictive.  A successful scavenge will reset the count
on consecutive GC's needed to exceed the GC overhead limit.

This is intended for HSX17.

http://cr.openjdk.java.net/~jmasa/6858496/webrev.00/

Thanks.