Integrated: 8297150: Add a @sealedGraph tag to Reference

[Per Minborg]

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">

This pull request has now been integrated.

Changeset: 390e69ad
Author:    Per Minborg <pminborg at openjdk.org>
Committer: Alan Bateman <alanb at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/390e69ad065ebefe2e998f6200d19d45cf043b16
Stats:     1 line in 1 file changed: 1 ins; 0 del; 0 mod

8297150: Add a @sealedGraph tag to Reference

Reviewed-by: darcy, alanb

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