[14] RFR (M) 8242082: Shenandoah: Purge Traversal mode

[Roman Kennke]

Looks good, thanks!

Roman


> Original fix:
>   https://bugs.openjdk.java.net/browse/JDK-8242082
>   https://hg.openjdk.java.net/jdk/jdk/rev/d8d2145c205c
> 
> The context is quite different due to missing Traversal-related backports. Otherwise it is pretty
> straightforward.
> 
> 14u webrev:
>   https://cr.openjdk.java.net/~shade/8242082/webrev.14u.01/
> 
> Testing: hotspot_gc_shenandoah, tier{1,2,3} with Shenandoah
>