Index: include/llvm/ADT/DenseSet.h
===================================================================
--- include/llvm/ADT/DenseSet.h
+++ include/llvm/ADT/DenseSet.h
@@ -104,6 +104,7 @@
     Iterator(const typename MapTy::iterator &i) : I(i) {}
 
     ValueT &operator*() { return I->getFirst(); }
+    const ValueT &operator*() const { return I->getFirst(); }
     ValueT *operator->() { return &I->getFirst(); }
 
     Iterator& operator++() { ++I; return *this; }
@@ -125,7 +126,7 @@
 
     ConstIterator(const typename MapTy::const_iterator &i) : I(i) {}
 
-    const ValueT &operator*() { return I->getFirst(); }
+    const ValueT &operator*() const { return I->getFirst(); }
     const ValueT *operator->() { return &I->getFirst(); }
 
     ConstIterator& operator++() { ++I; return *this; }