Add #include <iostream> since Value.h does not #include it any more.

llvm-svn: 14622
diff --git a/llvm/lib/Analysis/DataStructure/Steensgaard.cpp b/llvm/lib/Analysis/DataStructure/Steensgaard.cpp
index 12972ee..51d6134 100644
--- a/llvm/lib/Analysis/DataStructure/Steensgaard.cpp
+++ b/llvm/lib/Analysis/DataStructure/Steensgaard.cpp
@@ -19,6 +19,7 @@
 #include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Module.h"
 #include "Support/Debug.h"
+#include <iostream>
 using namespace llvm;
 
 namespace {