diff --git a/llvm/include/llvm/ADT/DenseMap.h b/llvm/include/llvm/ADT/DenseMap.h
--- a/llvm/include/llvm/ADT/DenseMap.h
+++ b/llvm/include/llvm/ADT/DenseMap.h
@@ -1244,19 +1244,18 @@
     return Ptr;
   }
 
-  bool operator==(const ConstIterator &RHS) const {
-    assert((!Ptr || isHandleInSync()) && "handle not in sync!");
+  friend bool operator==(const DenseMapIterator &LHS,
+                         const DenseMapIterator &RHS) {
+    assert((!LHS.Ptr || LHS.isHandleInSync()) && "handle not in sync!");
     assert((!RHS.Ptr || RHS.isHandleInSync()) && "handle not in sync!");
-    assert(getEpochAddress() == RHS.getEpochAddress() &&
+    assert(LHS.getEpochAddress() == RHS.getEpochAddress() &&
            "comparing incomparable iterators!");
-    return Ptr == RHS.Ptr;
+    return LHS.Ptr == RHS.Ptr;
   }
-  bool operator!=(const ConstIterator &RHS) const {
-    assert((!Ptr || isHandleInSync()) && "handle not in sync!");
-    assert((!RHS.Ptr || RHS.isHandleInSync()) && "handle not in sync!");
-    assert(getEpochAddress() == RHS.getEpochAddress() &&
-           "comparing incomparable iterators!");
-    return Ptr != RHS.Ptr;
+
+  friend bool operator!=(const DenseMapIterator &LHS,
+                         const DenseMapIterator &RHS) {
+    return !(LHS == RHS);
   }
 
   inline DenseMapIterator& operator++() {  // Preincrement