RFR (S) 8222130: Shenandoah should verify roots after pre-evacuation

[Roman Kennke]

> RFE:
>   https://bugs.openjdk.java.net/browse/JDK-8222130
> 
> Shenandoah verifier usually does the checks when the pause is over,
> and everything is done. One
> notable exception is evacuation path, where we do the
> verify_before_evacuation() check, then
> pre-evac the roots, and unblock. We need to check those roots are
> still fine after pre-evac by doing
> another verification step.
> 
> Fix:
>   http://cr.openjdk.java.net/~shade/8222130/wevrev.01/
> 
> Testing: Linux x86_64 fastdebug hotspot_gc_shenandoah


Looks good! Thanks!

Roman
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