RFR: Section on backporting [v7]

[Goetz Lindenmaier]

On Thu, 2 Dec 2021 19:34:09 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Guidance on backporting.
>> Also moved "Backing out a change" to the testing section where I believe it fits better. This section is unchanged.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixes after review

I think JBS should make transparent in which older release a bug was actually fixed by having a proper backported relation. That is why I don't like 1.

> However, those cases should be "the same" fix

We could redo the broken fix as-is with the same bug-id and have the backported relation. Then we could push the adaption to the target release as a follow-up bug.

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PR: https://git.openjdk.java.net/guide/pull/66