diff --git a/llvm/include/llvm/ADT/DenseMapInfo.h b/llvm/include/llvm/ADT/DenseMapInfo.h
--- a/llvm/include/llvm/ADT/DenseMapInfo.h
+++ b/llvm/include/llvm/ADT/DenseMapInfo.h
@@ -318,8 +318,19 @@
   }
 
   static bool isEqual(const Variant &LHS, const Variant &RHS) {
-    return LHS == RHS;
-  }
+    return LHS.index() == RHS.index() && std::visit(EqVisitor{}, LHS, RHS);
+  }
+
+ private:
+  struct EqVisitor {
+    template <typename T, typename U>
+    bool operator()(const T &LHS, const U &RHS) const {
+      return false;
+    }
+    template <typename T> bool operator()(const T &LHS, const T &RHS) const {
+      return DenseMapInfo<T>::isEqual(LHS, RHS);
+    }
+  };
 };
 } // end namespace llvm
 
diff --git a/llvm/unittests/ADT/DenseMapTest.cpp b/llvm/unittests/ADT/DenseMapTest.cpp
--- a/llvm/unittests/ADT/DenseMapTest.cpp
+++ b/llvm/unittests/ADT/DenseMapTest.cpp
@@ -736,5 +736,7 @@
   EXPECT_THAT(Map, testing::SizeIs(2));
   EXPECT_NE(DenseMapInfo<variant>::getHashValue(Keys[0]),
             DenseMapInfo<variant>::getHashValue(Keys[1]));
+  EXPECT_TRUE(DenseMapInfo<variant>::isEqual(Keys[0], Keys[0]));
+  EXPECT_FALSE(DenseMapInfo<variant>::isEqual(Keys[0], Keys[1]));
 }
 } // namespace