Index: include/llvm/ADT/DenseSet.h
===================================================================
--- include/llvm/ADT/DenseSet.h
+++ include/llvm/ADT/DenseSet.h
@@ -135,6 +135,7 @@
   const_iterator end() const { return ConstIterator(TheMap.end()); }
 
   iterator find(const ValueT &V) { return Iterator(TheMap.find(V)); }
+  const_iterator find(const ValueT &V) const { return ConstIterator(TheMap.find(V)); }
 
   /// Alternative version of find() which allows a different, and possibly less
   /// expensive, key type.