Integrated: 8260517: implement Sealed Classes as a standard feature in Java

[Vicente Romero]

On Fri, 16 Apr 2021 01:08:57 GMT, Vicente Romero <vromero at openjdk.org> wrote:

> Please review this PR that intents to make sealed classes a final feature in Java. This PR contains compiler and VM changes. In line with similar PRs, which has made preview features final, this one is mostly removing preview related comments from APIs plus options in test cases. Please also review the related [CSR](https://bugs.openjdk.java.net/browse/JDK-8265090)
> 
> Thanks
> 
> note: this PR is related to [PR-3528](https://github.com/openjdk/jdk/pull/3528) and must be integrated after it.

This pull request has now been integrated.

Changeset: 0fa9223f
Author:    Vicente Romero <vromero at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/0fa9223f34bc33635079763362f42f0a5c53759b
Stats:     444 lines in 54 files changed: 51 ins; 275 del; 118 mod

8260517: implement Sealed Classes as a standard feature in Java

Co-authored-by: Harold Seigel <hseigel at openjdk.org>
Co-authored-by: Vicente Romero <vromero at openjdk.org>
Reviewed-by: dholmes, mcimadamore, jlahoda

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PR: https://git.openjdk.java.net/jdk/pull/3526