RFR: Improve handling of squash and rebase of PRs

[Robin Westberg]

On Fri, 17 Apr 2020 15:42:33 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review this change that improves how we perform squashing and rebasing before doing the final integration.
>> Instead of using squash / rebase, simply merge the latest state of the target branch. Use the final state (tree) to
>> create the commit, and specify the proper parents. This has the benefit of working for merge PRs as well.  Best regards,
>> Robin
>
> I presume that there will be no change in the commit that is produced for non-merge PRs?

Certainly, there will be no difference in what is committed, the actual commit object will just be generated more
efficiently.

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PR: https://git.openjdk.java.net/skara/pull/589