add explicit #includes of iostream


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25510 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/bugpoint/ExtractFunction.cpp b/tools/bugpoint/ExtractFunction.cpp
index 7f9005a..ff88012 100644
--- a/tools/bugpoint/ExtractFunction.cpp
+++ b/tools/bugpoint/ExtractFunction.cpp
@@ -28,6 +28,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/FileUtilities.h"
 #include <set>
+#include <iostream>
 using namespace llvm;
 
 namespace llvm {