Integrated: Differentiate young generation marking.

[Bernd Mathiske]

On Wed, 18 Nov 2020 12:31:03 GMT, Bernd Mathiske <bmathiske at openjdk.org> wrote:

> This change is large to achieve uninterrupted functionality for single-generational Shenandoah while planting code that differentiates two distinct generations and concurrent marking for the young generation.
> 
> Where necessary we use templates to not impose runtime overhead. In code sections that are not runtime-critical we use conditions and switches over an enum that indicates which generational collection mode we are in (young or global).
> 
> We temporarily make all collections in generational mode young collections. Global and old collections will come later.

This pull request has now been integrated.

Changeset: fe1fe0b1
Author:    Bernd Mathiske <bmathiske at openjdk.org>
Committer: Roman Kennke <rkennke at openjdk.org>
URL:       https://git.openjdk.java.net/shenandoah/commit/fe1fe0b1
Stats:     367 lines in 17 files changed: 212 ins; 33 del; 122 mod

Differentiate young generation marking.

Reviewed-by: rkennke

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