RFR [9] Move sun.misc.Perf* classes to jdk.internal.perf

[Mandy Chung]

> On Jan 8, 2016, at 11:09 AM, Chris Hegarty <chris.hegarty at oracle.com> wrote:
> 
> There are a small number, three, of classes in sun.misc that are used
> by the platform for monitor and logging of the core platform itself. In
> preparation for JEP 260, these can be moved into a new internal
> package, jdk.internal.perf.
> 
> http://cr.openjdk.java.net/~chegar/sun.misc.Perf/

sun.misc.PerformanceLogger was added for java.desktop module to use.  I’d suggest to move it to java.desktop.

I assume this patch will go into jdk9/hs-rt instead of jdk9/dev.  It may be better to separate the change to use jdk.internal.ref.CleanerFactory as a separate changeset that will allow it to go in sooner.

Mandy