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

[JF Bastien]

Looks good overall, but I'll let @t.p.northover comment more.


REPOSITORY
  rL LLVM

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Comment at: lib/CodeGen/AtomicExpandPass.cpp:218
@@ -217,3 +217,1 @@
-  // It is the responsibility of the target to only return true in
-  // shouldExpandAtomicRMW in cases where this is required and possible.
   IRBuilder<> Builder(SI);
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Why remove this?

http://reviews.llvm.org/D7713

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