RFR: JDK-8308040 Evaluate new public types in non-public classes

[Joe Darcy]

On Wed, 17 May 2023 19:14:20 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:

> As reported by Marc Hoffman of javaalmanac.io, in a recent JDK 21 build there are new public types nested in non-public interfaces: 
> 
> java.lang.runtime.ReferenceKey.SoftKey 
> java.lang.runtime.ReferenceKey.StrongKey 
> java.lang.runtime.ReferenceKey.WeakKey 
> java.util.Digits.DecimalDigits 
> java.util.Digits.HexDigits 
> java.util.Digits.OctalDigits
> 
> This PR moves the nested classes to neighbouring package private classes

Marked as reviewed by darcy (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14039#pullrequestreview-1442553002