Integrated: Implement ShenandoahHeap::requires_barriers()

[Roman Kennke]

On Fri, 12 Feb 2021 20:39:26 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> This add proper implementation of requires_barriers() for ShenandoahHeap, and adds some comments to CollectedHeap about it.
> 
> Testing (with a few other fixes in the pipeline):
>  - [x] java/lang/Continuation (-XX:+UseShenandoahGC -XX:ShenandoahGCMode=aggressive)
>  - [x] java/lang/Thread/virtual  (-XX:+UseShenandoahGC -XX:ShenandoahGCMode=aggressive)

This pull request has now been integrated.

Changeset: 026a3eba
Author:    Roman Kennke <rkennke at openjdk.org>
Committer: Ron Pressler <rpressler at openjdk.org>
URL:       https://git.openjdk.java.net/loom/commit/026a3eba
Stats:     16 lines in 3 files changed: 13 ins; 0 del; 3 mod

Implement ShenandoahHeap::requires_barriers()

Reviewed-by: rpressler

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PR: https://git.openjdk.java.net/loom/pull/29