RFR: 8204165: Filter out tests requiring class unloading when ClassUnloading is disabled

[Kim Barrett]

> On May 31, 2018, at 8:01 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to annotate jtreg tests that require ClassUnloading with @requires vm.opt.final.ClassUnloading.
> 
> http://cr.openjdk.java.net/~stefank/8204165/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8204165
> 
> This @requires tag will filter out these tests when run with -XX:-ClassUnloading or when run with GC that doesn't support class unloading.
> 
> For the discussion around the introduction of the vm.opt.final tags, see: http://mail.openjdk.java.net/pipermail/hotspot-dev/2018-May/032586.html
> 
> Thanks,
> StefanK

Looks good.  (Some copyrights to update…)