RFR: Reset task queue stats before rset scan

[Kelvin Nilsen]

On Thu, 16 Sep 2021 20:06:11 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This change fixes an assert caused when task queue stats were reset after the rset scan has pushed oops into the queues (all of those "pushes" become uncounted).

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.java.net/shenandoah/pull/69