Replace OwningPtr with std::unique_ptr.

This compiles cleanly with lldb/lld/clang-tools-extra/llvm.

llvm-svn: 203279
diff --git a/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
index fd3c8f1..00fd971 100644
--- a/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
@@ -28,8 +28,8 @@
 class UndefResultChecker 
   : public Checker< check::PostStmt<BinaryOperator> > {
 
-  mutable OwningPtr<BugType> BT;
-  
+  mutable std::unique_ptr<BugType> BT;
+
 public:
   void checkPostStmt(const BinaryOperator *B, CheckerContext &C) const;
 };