Unbreak VC++ build.

llvm-svn: 34917
diff --git a/llvm/lib/Analysis/IPA/Andersens.cpp b/llvm/lib/Analysis/IPA/Andersens.cpp
index 52b1919..0a281c8 100644
--- a/llvm/lib/Analysis/IPA/Andersens.cpp
+++ b/llvm/lib/Analysis/IPA/Andersens.cpp
@@ -62,6 +62,7 @@
 #include "llvm/Analysis/Passes.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/ADT/Statistic.h"
+#include <algorithm>
 #include <set>
 using namespace llvm;