RFR(XXS) 8223184: Shenandoah: Missing roots in SRP::process_all_roots_slow

[Roman Kennke]

Isn't JvmtiExport::weak_oops_do() covered by WeakProcessor already?

Roman

> Added missing roots in SRP::process_all_root_slow().
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8223184
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8223184/webrev.00/
> 
> Test:
>    hotspot_gc_shenandoah with -XX:+ShenandoahVerify (fastdebug and release)
> 
> Thanks,
> 
> -Zhengyu
>