RFR: 8246774: Record Classes (final) implementation [v3]

[Vicente Romero]

On Thu, 24 Sep 2020 15:45:22 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> The classfile parser changes look good to me.
>
> I have modified the `@since`: 14 -> 16

[CSR: Record Classes](https://bugs.openjdk.java.net/browse/JDK-8253605)

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PR: https://git.openjdk.java.net/jdk/pull/290