diff --git a/llvm/include/llvm/CodeGen/LiveIntervalUnion.h b/llvm/include/llvm/CodeGen/LiveIntervalUnion.h
--- a/llvm/include/llvm/CodeGen/LiveIntervalUnion.h
+++ b/llvm/include/llvm/CodeGen/LiveIntervalUnion.h
@@ -174,6 +174,8 @@
 
   public:
     Array() = default;
+    Array &operator=(const Array &other) = delete;
+    Array(const Array &other) = delete;
     ~Array() { clear(); }
 
     // Initialize the array to have Size entries.