RFR: Cherry-pick 8209854: ProblemList MemberNameLeak

[Roman Kennke]

Am 24.08.2018 um 08:58 schrieb Aleksey Shipilev:
> Our nightly testing fails for the similar reason that it fails upstream with CMS:
>   https://bugs.openjdk.java.net/browse/JDK-8209854
>   http://hg.openjdk.java.net/jdk/jdk/rev/71c3b8c51977
> 
> Let's pick the ProblemList change to make nightlies pass.
> 
> Thanks,
> -Aleksey
> 

Sure.