Make iostream #inclusion explicit


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25514 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LoopUnroll.cpp b/lib/Transforms/Scalar/LoopUnroll.cpp
index 75df8bb..a9dba4b 100644
--- a/lib/Transforms/Scalar/LoopUnroll.cpp
+++ b/lib/Transforms/Scalar/LoopUnroll.cpp
@@ -32,7 +32,7 @@
 #include <cstdio>
 #include <set>
 #include <algorithm>
-
+#include <iostream>
 using namespace llvm;
 
 namespace {