RFR: 8297150: Add a @sealedGraph tag to Reference

Wed Nov 16 17:23:27 UTC 2022

On Wed, 16 Nov 2022 16:52:50 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to opt in for graphic rendering of the sealed hierarchy of the `Reference` class.
> 
> Rendering capability was added via https://bugs.openjdk.org/browse/JDK-8295653
> 
> Here is how it would look like:
> 
> <img width="449" alt="Reference_SH" src="https://user-images.githubusercontent.com/7457876/202243138-7f2a799a-dc67-4c4e-9322-c18bf05d73e7.png">

Marked as reviewed by darcy (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/11191