Needed <iostream> for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31816 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DataStructure/Printer.cpp b/lib/Analysis/DataStructure/Printer.cpp
index ce99961..b425e4e 100644
--- a/lib/Analysis/DataStructure/Printer.cpp
+++ b/lib/Analysis/DataStructure/Printer.cpp
@@ -21,6 +21,7 @@
 #include "llvm/Support/GraphWriter.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Config/config.h"
+#include <iostream>
 #include <fstream>
 #include <sstream>
 using namespace llvm;