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

[JF Bastien]

I also re-ran clang-format, some of the code wasn't formatted with it.


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  rL LLVM

================
Comment at: lib/CodeGen/AtomicExpandPass.cpp:244
@@ -231,1 +243,3 @@
+  }
+  };
 }
----------------
I removed the semicolon here, and had to add `llvm_unreachable` because not all compilers realize that all cases are handled.

http://reviews.llvm.org/D7713

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