RFR: JDK-8280168 Add Objects.toDefaultString [v3]

[Roger Riggs]

On Wed, 19 Jan 2022 18:48:48 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> While it is strongly recommend to not use the default toString for a class, at times it is the least-bad alternative. When that alternative needs to be used, it would be helpful to have the implementation already available, such as in Objects.toDefaultString(). This method is analagous to System.identityHashCode.
>> 
>> Please also review the CSR: https://bugs.openjdk.java.net/browse/JDK-8280184
>
> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Respond to review feedback to augment test.

LGTM,  thanks

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Marked as reviewed by rriggs (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7139