RFR (XS) 8225441: Cleanup ShenandoahHeap::atomic_compare_exchange_oop

[Roman Kennke]

>> We could also just use RawAccess<>::oop_atomic_cmpxchg() instead. That
>> does the same thing afaics. However, doing our owns is better
>> backportable (to 8). What do you think?
> 
> Let's do this one for backports, and then the follow-up to use RawAccess, where available?

Sounds good.

Roman

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