RFR: (Re-)Enable arraycopy C2 optimizations for non-traversal GC

[Aleksey Shipilev]

On 06/18/2018 06:24 PM, Roman Kennke wrote:
> Looks like I've accidentally disabled the arraycopy-to-loadstores
> optimization wholesale during the C2 barriers merge. We actually support
> that optimization for non-traversal-GC. Traversal GC requires more
> complicated storeval-barriers, that will probably come when Roland's
> work arrives.
> 
> http://cr.openjdk.java.net/~rkennke/enable-arycopy-c2-opt/webrev.00/
> 
> Testing: tier3_gc_shenandoah (ongoing)
> 
> Ok?

OK! Minor nit, double new-line:

 941
 942

Thanks,
-Aleksey