rnk added inline comments.

================
Comment at: lib/CodeGen/CGBuiltin.cpp:2730
+        llvm::AtomicOrdering::SequentiallyConsistent);
+    return Builder.CreateSub(RMWI, ConstantInt::get(IntTy, 1));
   }
----------------
Can you make a helper similar to MakeBinaryAtomicValue for inc/dec and share 
this code with the 16 and 32-bit atomic increment implementations? You can do 
something like `Builder.CreateBinOp(Inc ? Instruction::Add : Instruction::Sub, 
...)`


https://reviews.llvm.org/D25576



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