RFR: Some barriers are omitted from ergonomic decisions

[Roman Kennke]

Am 12.04.2018 um 14:33 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/barrier-disable-left/webrev.01/
> 
> Found in Partial->Traversal RFR.
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks,
> -Aleksey
> 

Looks good. Thank you!

Roman