RFR(xxs): 8157271: Avoid extra copy of NativeCallStack

[Zhengyu Gu]

Look good to me.

-Zhengyu


On 12/08/2016 05:11 PM, Max Ockner wrote:
> Hello,
>
> Please review this one line enhancement. We formerly passed a copy of 
> a NativeCallStack into MallocSiteHashtableEntry. We now pass a 
> reference instead.
>
> bug: https://bugs.openjdk.java.net/browse/JDK-8157271
> webrev: http://cr.openjdk.java.net/~mockner/8157271.01/
>
> tested with runtime/NMT jtreg tests.
>
> Thanks,
> Max