RFR: JDK-8207169: X86: Modularize cmpxchg-oop assembler for C1 and C2

[Roman Kennke]

>> http://cr.openjdk.java.net/~rkennke/JDK-8207169/webrev.01/
> 
> So tmp registers would allocated in
> BarrierSetC1::atomic_cmpxchg_at_resolved()?
> 

Yes. Or rather, in a subclass that needs it.

Roman


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