RFR: 8210321: Create NO_KEEPALIVE CLD holder accessor

[coleen.phillimore at oracle.com]

I thought the ClassLoaderData::is_alive() function would do this for you?
thanks,
Coleen

On 9/3/18 10:38 AM, Erik Österlund wrote:
> Hi,
>
> In order to perform concurrent class unloading, ZGC needs a way to 
> peek the holder without keeping it alive.
>
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8210321/webrev.00/
>
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8210321
>
> Thanks,
> /Erik