[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

llvm-svn: 206243
diff --git a/llvm/lib/Analysis/NoAliasAnalysis.cpp b/llvm/lib/Analysis/NoAliasAnalysis.cpp
index 0c119d6..4e11e50 100644
--- a/llvm/lib/Analysis/NoAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/NoAliasAnalysis.cpp
@@ -36,7 +36,7 @@
       // Note: NoAA does not call InitializeAliasAnalysis because it's
       // special and does not support chaining.
       DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
-      DL = DLP ? &DLP->getDataLayout() : 0;
+      DL = DLP ? &DLP->getDataLayout() : nullptr;
     }
 
     AliasResult alias(const Location &LocA, const Location &LocB) override {