Update LLVM for 3.5 rebase (r209712).

Change-Id: I149556c940fb7dc92d075273c87ff584f400941f
diff --git a/lib/Transforms/Utils/CmpInstAnalysis.cpp b/lib/Transforms/Utils/CmpInstAnalysis.cpp
index 8fa412a..3b15a0a 100644
--- a/lib/Transforms/Utils/CmpInstAnalysis.cpp
+++ b/lib/Transforms/Utils/CmpInstAnalysis.cpp
@@ -84,7 +84,7 @@
     case 7: // True.
       return ConstantInt::get(CmpInst::makeCmpResultType(LHS->getType()), 1);
   }
-  return NULL;
+  return nullptr;
 }
 
 /// PredicatesFoldable - Return true if both predicates match sign or if at