RFR: Always copy forward for disjoint arrays

[Aleksey Shipilev]

On 11/09/2018 09:49 PM, Zhengyu Gu wrote:
>> Any chance for a quick regression test that triggers it?
> 
> Yep, added Jiri's reproducer.
> 
> Updated webrev: http://cr.openjdk.java.net/~zgu/shenandoah/disjoint_arraycopy/webrev.01/

Thanks! Minor corrections are in this patch, please consider applying it before pushing:
  http://cr.openjdk.java.net/~shade/shenandoah/shade-ac-fixes-1.patch

-Aleksey