RFR: Generation affiliation transitions for heap regions. [v3]

[Roman Kennke]

On Tue, 17 Nov 2020 13:40:39 GMT, Bernd Mathiske <bmathiske at openjdk.org> wrote:

>> Preparatory renaming generation->affiliation since we will want to have a class called ShenandoahGeneration that is not an enum. The next PR will build on this. It will be a big refactoring that pulls code out of the ShenandoahHeap class and puts it into generation-specific classes that are subclasses of ShenandoahGeneration.
>> 
>> The Affiliation declaration still sits in AllocRequest and not in ShenandoahHeapRegion or ShenandoahGeneration for the same reason as before: it is hard to get anything to compile in other combinations of what goes where. I tried.
>> 
>> The card table update code in the set_affiliation() will be revised and augmented later, but seems OK as a first step.
>
> Bernd Mathiske has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add missing precomiled header include for Windows builds.

Looks good to me! Thanks!

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Marked as reviewed by rkennke (Reviewer).

PR: https://git.openjdk.java.net/shenandoah/pull/7