DWARF: Include <algorithm> explicitly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139773 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFDebugLine.cpp b/lib/DebugInfo/DWARFDebugLine.cpp
index ba68433..9db86c3 100644
--- a/lib/DebugInfo/DWARFDebugLine.cpp
+++ b/lib/DebugInfo/DWARFDebugLine.cpp
@@ -11,6 +11,7 @@
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
+#include <algorithm>
 using namespace llvm;
 using namespace dwarf;