RFR(XS): Minor cleanup on ShenandoahHeapRegion's LiveData counter

[Aleksey Shipilev]

On 09/28/2016 03:12 PM, Zhengyu Gu wrote:
> Shenandoah heap region's LiveData counters are set and cleared by VM
> thread, so no atomic operations are need.
> 
> However, getLiveData() can read the counters updated by
> increase_live_data() method, so load_acquire() is needed.
> 
> 
> Webrev:http://cr.openjdk.java.net/~zgu/cleanup_1/webrev/

I have a question on changes in
src/share/vm/gc/shenandoah/shenandoahHeap.cpp -- are these the changes
you intended to do? These seem to have nothing to do with
ShenandoahHeapRegion::liveData.

Thanks,
-Aleksey