RFR (XS) 8225441: Cleanup ShenandoahHeap::atomic_compare_exchange_oop

[Aleksey Shipilev]

RFE:
  https://bugs.openjdk.java.net/browse/JDK-8225441

These helper functions can use smaller name and be static to boot.

Webrev:
  http://cr.openjdk.java.net/~shade/8225441/webrev.01/

Testing: hotspot_gc_shenandoah

-- 
Thanks,
-Aleksey

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