Add #include


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4291 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Timer.cpp b/lib/Support/Timer.cpp
index fb38fcb..d0ce71f 100644
--- a/lib/Support/Timer.cpp
+++ b/lib/Support/Timer.cpp
@@ -12,6 +12,7 @@
 #include <stdio.h>
 #include <iostream>
 #include <algorithm>
+#include <functional>
 
 static TimerGroup *DefaultTimerGroup = 0;
 static TimerGroup *getDefaultTimerGroup() {