Unbreak VC++ build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34917 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-prof/llvm-prof.cpp

@@ -21,6 +21,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/System/Signals.h"
+#include <algorithm>
 #include <iostream>
 #include <iomanip>
 #include <map>