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

[Peter Levart]

On Fri, 25 Sep 2020 02:38:01 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> I have modified the `@since`: 14 -> 16
>
> [CSR: Record Classes](https://bugs.openjdk.java.net/browse/JDK-8253605)

Hi @vicente-romero-oracle , note that besides tests, there is also a JMH benchmark that measures the performance of
records deserialization which forced us to modify the build procedure for all benchmarks to include --enable-preview
option in JDK 15 and backports (see https://bugs.openjdk.java.net/browse/JDK-8248135). If you undo this change in JDK
16 then also the problem described in https://bugs.openjdk.java.net/browse/JDK-8250669 and
https://bugs.openjdk.java.net/browse/JDK-8248429 will disapear. After that, perhaps undoing the same for JDK 15 and
backports together with removing the benchmark is also possible to resolve the issues in older releases as most
developement will probably happen in JDK 16 then and so the need for performance testing will mostly be needed in
there. We still have to figure out how to enable having benchmarks for preview features as in the future the sure will
be a need for that.

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