Amending r254423 by deleting the copy constructor and adding a move constructor instead; NFC as neither of these constructors are currently called, but this is a safer design.

llvm-svn: 254515

clang/include/clang/Sema/AttributeList.h

@@ -557,6 +557,13 @@ public:
   /// Create a new pool for a factory.
   AttributePool(AttributeFactory &factory) : Factory(factory), Head(nullptr) {}
 
+  AttributePool(AttributePool &) = delete;
+
+  /// Move the given pool's allocations to this pool.
+  AttributePool(AttributePool &&pool) : Factory(pool.Factory), Head(pool.Head) {
+    pool.Head = nullptr;
+  }
+
   AttributeFactory &getFactory() const { return Factory; }
 
   void clear() {