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

[Roman Kennke]

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/

Bug:
https://bugs.openjdk.java.net/browse/JDK-8206407

Can I get reviews?

Roman

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