RFR: Mark concurrent roots as global when requested to do so, instead of young

Tue Feb 16 10:27:03 UTC 2021

On Tue, 16 Feb 2021 10:17:01 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> This is probably a merge error from the last big merge that brought in concurrent roots marking.
> 
> Testing:
>  - [x] hotspot_gc_shenandoah
>  - [ ] tier1 (+UseShenandoahGC)

This makes sense. Looks good and trivial.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/shenandoah/pull/15