RFR: Clear young generation reference to old mark queues when starting global collect

[Roman Kennke]

On Thu, 18 Nov 2021 19:45:40 GMT, William Kemper <wkemper at openjdk.org> wrote:

> If concurrent marking in old is preempted by a _global_ collection, the old mark is abandoned. The young generation should no longer hold a reference to the old mark queues.  Without this fix, collections in young generation may erroneously behave as though concurrent mark in old is still running.

Marked as reviewed by rkennke (Lead).

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PR: https://git.openjdk.java.net/shenandoah/pull/99