RFR: 8251861: Remove unused jdk.internal.ref.SoftCleanable and WeakCleanable

[Roger Riggs]

On Mon, 12 Oct 2020 19:36:52 GMT, Kiran Sidhartha Ravikumar <kravikumar at openjdk.org> wrote:

> Hi Guys,
> 
> Please review the fix to remove jdk.internal.ref.SoftCleanable and WeakCleanable classes as there is no visible usage
> of them in JDK. Currently, only PhantomCleanable is used.
> More information can be viewed at https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-August/067997.html
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8251861
> 
> Thanks,
> Kiran

Marked as reviewed by rriggs (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/616