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

llvm-svn: 14622
diff --git a/llvm/lib/Transforms/Instrumentation/ProfilePaths/RetracePath.cpp b/llvm/lib/Transforms/Instrumentation/ProfilePaths/RetracePath.cpp
index cbb2ae6..21d11be 100644
--- a/llvm/lib/Transforms/Instrumentation/ProfilePaths/RetracePath.cpp
+++ b/llvm/lib/Transforms/Instrumentation/ProfilePaths/RetracePath.cpp
@@ -16,6 +16,7 @@
 #include "llvm/iOther.h"
 #include "llvm/Support/CFG.h"
 #include "Graph.h"
+#include <iostream>
 
 using std::vector;
 using std::map;