Add explicit iostream #includes

llvm-svn: 25513
diff --git a/llvm/lib/Analysis/DataStructure/TopDownClosure.cpp b/llvm/lib/Analysis/DataStructure/TopDownClosure.cpp
index c1a6cb8..2271fa4 100644
--- a/llvm/lib/Analysis/DataStructure/TopDownClosure.cpp
+++ b/llvm/lib/Analysis/DataStructure/TopDownClosure.cpp
@@ -21,6 +21,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/ADT/Statistic.h"
+#include <iostream>
 using namespace llvm;
 
 #if 0