RFR (S) 8240868: Shenandoah: remove CM-with-UR piggybacking cycles

[Zhengyu Gu]

Yes, I like it. Looks good to me.

Thanks,

-Zhengyu

On 3/11/20 8:23 AM, Aleksey Shipilev wrote:
> RFR:
>    https://bugs.openjdk.java.net/browse/JDK-8240868
> 
> See the rationale in description.
> 
> Webrev:
>    https://cr.openjdk.java.net/~shade/8240868/webrev.01/
> 
> Testing: hotspot_gc_shenandoah {fastdebug,release}
>