[14] RFR 8237369: Shenandoah: failed vmTestbase/nsk/jvmti/AttachOnDemand/attach021/TestDescription.java test

[Roman Kennke]

Yes, good catch!

Roman

> Please review this small patch. keep_alive is only applicable during
> marking phase.
> 
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8237369
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8237369/webrev.00/
> 
> Test:
>   hotspot_gc_shenandoah
> 
>   vmTestbase/nsk/jvmti/AttachOnDemand/attach021/TestDescription.java
>   with Shenandoah GC (normal and traversal mode)
> 
> 
> Thank,
> 
> -Zhengyu
>