Request for review(M): 7020521: arraycopy stubs place prebarriers incorrectly

[Vladimir Kozlov]

Looks good. Thank you for cleaning it up.

Vladimir

Igor Veresov wrote:
> I rearranged the pre-barrier placement in arraycopy stubs so that they 
> are properly called in case of chained calls. Also refactored the code a 
> little bit so that it looks uniform across the platforms and is more 
> readable.
> 
> Webrev: http://cr.openjdk.java.net/~iveresov/7020521/webrev.00
> 
> Thanks,
> igor