In preparation for JEP 260, the performance counters can be moved out of sun.misc and located somewhere more appropriate, like jdk.internal.perf.
http://cr.openjdk.java.net/~chegar/8146736/ Mandy asked whether this change should go through jdk9/hs-rt or jdk9/dev, I see no strong reason why is should go through hs-rt, so propose to go through jdk9/dev, unless there are objections. The hotspot changes are minor. Note: the use of cleaner in Perf will be replaced with the proposed CleanerFactory when it is added. -Chris.
