Update for llvm api change.

llvm-svn: 210919
diff --git a/lld/lib/ReaderWriter/Reader.cpp b/lld/lib/ReaderWriter/Reader.cpp
index 49612fb..5bb261d 100644
--- a/lld/lib/ReaderWriter/Reader.cpp
+++ b/lld/lib/ReaderWriter/Reader.cpp
@@ -9,6 +9,7 @@
 
 #include "lld/ReaderWriter/Reader.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Errc.h"
 #include "llvm/Support/FileUtilities.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
@@ -42,7 +43,7 @@
       return reader->parseFile(mb, *this, result);
 
   // No Reader could parse this file.
-  return std::make_error_code(std::errc::executable_format_error);
+  return make_error_code(llvm::errc::executable_format_error);
 }
 
 static const Registry::KindStrings kindStrings[] = {