RFR(T) 8233796: Shenandoah is broken after 8233708

[Roman Kennke]

Ok.

Roman


> Please review this trivial patch to unbreak Shenandoah build.
> 
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8233796
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8233796/webrev.00/
> 
> 
> Thanks,
> 
> -Zhengyu
>