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

llvm-svn: 14622
diff --git a/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp b/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp
index c518821..b7c19e6 100644
--- a/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp
@@ -24,6 +24,8 @@
 #include "llvm/Module.h"
 #include "llvm/Pass.h"
 #include "ProfilingUtils.h"
+#include <iostream>
+
 using namespace llvm;
 
 namespace {