[llvm-readobj][NFC]
Appeasing mingw without C++11 std::to_string

llvm-svn: 222369
diff --git a/llvm/tools/llvm-readobj/COFFDumper.cpp b/llvm/tools/llvm-readobj/COFFDumper.cpp
index 4e1bf2c..5276428 100644
--- a/llvm/tools/llvm-readobj/COFFDumper.cpp
+++ b/llvm/tools/llvm-readobj/COFFDumper.cpp
@@ -20,6 +20,7 @@
 #include "Win64EHDumper.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Object/COFF.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/COFF.h"
@@ -1086,7 +1087,7 @@
   case COFF::IMAGE_REL_BASED_HIGHLOW: return "HIGHLOW";
   case COFF::IMAGE_REL_BASED_HIGHADJ: return "HIGHADJ";
   case COFF::IMAGE_REL_BASED_DIR64: return "DIR64";
-  default: return "unknown (" + std::to_string(Type) + ")";
+  default: return "unknown (" + llvm::utostr(Type) + ")";
   }
 }