Add some missing UseShenandoahGC checks to 8u

[Aleksey Shipilev]

On 09/21/2017 06:04 PM, Roland Westrelin wrote:
> 
>> I see! I wonder if it's cleaner/safer to revert to upstream and
>> conditionalize the entire block on UseShenandoahGC then, to make it
>> obvious the upstream code stays the same, instead of trying to play
>> games with locals... I.e. so that the original upstream code was the
>> same "if" branch:
> 
> This?
> 
> http://cr.openjdk.java.net/~roland/shenandoah/8u_useshenandoahgc/webrev.01/

Yes, looks much better to me!

Thanks,
-Aleksey