[15] RFR 8238162: Shenandoah: Remove ShenandoahTaskTerminator wrapper

[Aleksey Shipilev]

On 2/4/20 2:35 PM, Zhengyu Gu wrote:
> I can not recall why we still have terminator wrapper, probably a 
> leftover after we upstreamed OWST terminator. Let's remove it.

I think we have upstreamed our version here? If so, please link it to 8238162:
  https://bugs.openjdk.java.net/browse/JDK-8204947

> Bug: https://bugs.openjdk.java.net/browse/JDK-8238162
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8238162/webrev.00/index.html

Looks good.

-- 
Thanks,
-Aleksey