add #include


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55252 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 104dc77..432e603 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Format.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Config/config.h"
 #include <ostream>