RFR: Differentiate young generation marking.

Tue Dec 8 17:28:00 UTC 2020

On Mon, 7 Dec 2020 17:40:12 GMT, Bernd Mathiske <bmathiske at openjdk.org> wrote:

>> I merged the latest openjdk/jdk code into the genshen branch. This gives us concurrent weak reference processing, better GH actions test coverage and lots of other goodies. Can you please merge that into your branch?
>
> Will do, thanks!

Rebased and substantially simplified. I would no longer call this a refactoring. Should be straight forward to read through this now. Ready for review etc.

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PR: https://git.openjdk.java.net/shenandoah/pull/8