RFR (S) 8240076: Shenandoah: pacer should cover reset and preclean phases

[Zhengyu Gu]

Looks good to me.

-Zhengyu

On 2/26/20 6:52 AM, Aleksey Shipilev wrote:
> RFE:
>    https://bugs.openjdk.java.net/browse/JDK-8240076
> 
> See bug above for discussion.
> 
> Webrev:
>    https://cr.openjdk.java.net/~shade/8240076/webrev.01/
> 
> Testing: hotspot_gc_shenandoah, eyeballing logs
>