RFR: 8225217: Backout: JDK-8224814: Remove dead JNIHandleBlock freelist code

[Kim Barrett]

> On Jun 4, 2019, at 6:56 PM, David Holmes <david.holmes at oracle.com> wrote:
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8225217
> webrev: http://cr.openjdk.java.net/~dholmes/8225217/webrev/
> 
> Original patch: http://hg.openjdk.java.net/jdk/jdk/rev/47d928ba8733
> 
> It turns out the freelist code wasn't quite dead but played a role in cleaning up deleted local references, without which we end up with "null" handles being left around.
> 
> Simplest solution is to backout that change and it will be re-examined for 14.
> 
> Thanks,
> David
> -----

Looks good.