8201487: Do not rebalance reference processing queues if not doing parallel reference processing
Reviewed-by: sangheki, kbarrett
Welcome to OpenJDK!
===================
For information about building OpenJDK, including how to fully retrieve all
source code, please see either of these:
* doc/building.html (html version)
* doc/building.md (markdown version)
See http://openjdk.java.net/ for more information about OpenJDK.