RFR(T): 8216482: Shenandoah: typo in ShenandoahBarrierSetC2::clone_barrier_at_expansion() causes failed compilations

[Roman Kennke]

Looks good to me. Also, trivial.

Thanks for spotting this!

Roman

> This was observed to sometimes hurt performance:
> 
> http://cr.openjdk.java.net/~roland/8216482/webrev.00/
> 
> Roland.
> 

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