[PATCH] Mutate TargetLowering::shouldExpandAtomicRMWInIR to specifically dictate how AtomicRMWInsts are expanded.

[JF Bastien]

@DiamondLovesYou: could you re-upload this patch? It looks like the latest one is an incremental patch comparing your previous one, not a patch from tip-of-tree. Once that's done I'll be able to commit.


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  rL LLVM

http://reviews.llvm.org/D7713

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