JDK 16 RFR of JDK-8246222: Rename javac test T6395981.java to be more informative

[Jonathan Gibbons]

I dunno, Joe, seems like a big deal to me! Maybe you need a second and 
third opinion.

Just kidding.

+1

-- Jon

On 6/12/20 12:40 PM, Joe Darcy wrote:
> Hello,
>
> One of the langtools tests which gets updated on each release is 
> T6395981.java and I'd like to give it the more descriptive name 
> TestGetSourceVersions.java. Please review the webrev for this:
>
>     http://cr.openjdk.java.net/~darcy/8246222.0/
>
> Thanks,
>
> -Joe
>