RFR: 8256370: Add asserts to Reference.getInactive()

[Roman Kennke]

On Sun, 22 Nov 2020 22:15:20 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> I didn't notice this before it was integrated.
> 
> The test for inactive isn't right; rather than `next == this` it
> should be `next != null`. This becomes apparent once
> FinalizerHistogram is fixed to call getInactive() rather than get().
> 
> I noticed this while working on JDK-8256517, where I ran into some
> similar issues. I will address these problems as part of that change.

Oh ok. Thanks for taking care of it!

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PR: https://git.openjdk.java.net/jdk/pull/1231