RFR: Small cleanups in java.lang.ref

[Kim Barrett]

> On May 18, 2018, at 5:40 PM, Roger Riggs <roger.riggs at oracle.com> wrote:
> 
> Hi Kim,
> 
> In the cleanup category also is:JDK-8132984 <https://bugs.openjdk.java.net/browse/JDK-8132984> incorrect type for Reference.discovered
> 
> Is that within the scope of 8203028?

I’d like to keep them separate.

8203028 is VM code change with some implementation comment updates (not
specification changes) in java.lang.ref.(Reference|ReferenceQueue). It doesn’t
change any Java code at all.