RFR: JDK-8206407: Primitive atomic_cmpxchg_in_heap_at() in BarrierSet::Access needs to call non-oop raw method

[Roman Kennke]

Hi Per,

>> BarrierSet::Access:atomic_cmpxchg_in_heap_at() is currently calling
>> Raw::oop_atomic_cmpxchg_at() which is obviously wrong.
>>
>> We've been lucky because primitive is not bound in default OpenJDK.
>>
>> Even in Shenandoah land we've been lucky because primitives don't match
>> narrowOop and thus don't get (attempted to) encoded/decoded.
>>
>> Lucky us.
>>
>> Let's fix it anyway:
>> http://cr.openjdk.java.net/~rkennke/JDK-8206407/webrev.00/
> 
> Nice catch! Looks good!

Thanks for reviewing!

Does it qualify for trivial-doesn't-have-to-wait-24h-rule? I believe it
does, it's 1 line that is not even touched by default.

Roman

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