Add missing cctype includes.

llvm-svn: 161660
diff --git a/clang/lib/Analysis/CocoaConventions.cpp b/clang/lib/Analysis/CocoaConventions.cpp
index 7e9e38f..ce973af 100644
--- a/clang/lib/Analysis/CocoaConventions.cpp
+++ b/clang/lib/Analysis/CocoaConventions.cpp
@@ -17,6 +17,8 @@
 #include "clang/AST/DeclObjC.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/ErrorHandling.h"
+#include <cctype>
+
 using namespace clang;
 using namespace ento;