RFR: couple small fixes from lucene testing

[Aleksey Shipilev]

On 10/11/2018 10:09 AM, Roland Westrelin wrote:
> 
>> Looks okay. These fixes look generic, are you planning to upstream them? Otherwise, we need to
>> protect them with UseShenandoahGC.
> 
> The loop predicate change is part of a piece of code that's not yet
> upstream. I'll get the other one upstream with a collection of other
> small changes.

OK.

-Aleksey