Add missing include (<functional> for std::ref)

dwblaikie · dwblaikie · commit a25e2069739b · 2018-08-20T20:02:29.000Z
llvm-svn: 340205
diff --git a/llvm/lib/Demangle/ItaniumDemangle.cpp b/llvm/lib/Demangle/ItaniumDemangle.cpp
@@ -19,6 +19,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <functional>
 #include <numeric>
 #include <utility>
 #include <vector>
