Add raw_ostream include to pacify MSVC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169097 91177308-0d34-0410-b5e6-96231b3b80d8

lib/StaticAnalyzer/Checkers/ObjCSelfInitChecker.cpp

@@ -44,6 +44,7 @@
 #include "clang/StaticAnalyzer/Core/PathSensitive/ProgramStateTrait.h"
 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
 #include "clang/AST/ParentMap.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace clang;
 using namespace ento;