The unused cache is being unnecessarily activated (ThreadLocal) when buffers are being released.
http://cr.openjdk.java.net/~jlaskey/8154179/webrev/index.html <http://cr.openjdk.java.net/~jlaskey/8154179/webrev/index.html> https://bugs.openjdk.java.net/browse/JDK-8154179 <https://bugs.openjdk.java.net/browse/JDK-8154179>
