RFR: 8221913: Add GC.selected() jtreg-ext function

[Per Liden]

Looks good!

/Per

On 4/3/19 8:44 PM, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to add a convenience function to get the 
> selected GC in jtreg tests.
> 
> https://cr.openjdk.java.net/~stefank/8221913/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8221913
> 
> Thanks,
> StefanK