RFR: 8253224: Shenandoah: ShenandoahStrDedupQueue destructor calls virtual num_queues()

[Zhengyu Gu]

On Wed, 16 Sep 2020 08:16:50 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Static analysis complains that `ShenandoahStrDedupQueue` destructor calls virtual `num_queues()`. We can just do the
> `_nv` version to make this right.
> Testing: hotspot_gc_shenandoah

Marked as reviewed by zgu (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/202