RFR: JDK-8149925 We don't need jdk.internal.ref.Cleaner any more

[Mandy Chung]

> On Feb 23, 2016, at 3:22 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
> I'm not sure what to do about any of this; I'm just feeling like maybe
> the proposed API / implementation isn't quite right yet.

I suggest restore the JavaLangRefAccess used by direct byte buffer code and revisit such explicit mechanism until there is a need.

Another concern is that this method gets to run in any arbitrary thread rather than the dedicated reference handler thread / cleaner thread.

Mandy