RFR (T) 8235685: Shenandoah: Enable leak profiler

[Roman Kennke]

Yes, good!

Thanks,
Roman


> Please review this trivial patch that enables JFR leak profiler for
> Shenandoah.
> 
> JDK-8235174 enhancement also applies to Shenandoah, we can enable leak
> profiler as well.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8235685
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8235685/weberv.00/
> 
> Test:
>   Use jmc to create JFR recording, eyeball Memory->Live Objects
> 
> 
> Thanks,
> 
> -Zhengyu
>