[clang][bytecode][NFC] Delete DynamicAllocator copy/move ctors (llvm#139710)

They should never be needed.

Author: tbaederr

clang/lib/AST/ByteCode/DynamicAllocator.h

@@ -59,6 +59,8 @@ class DynamicAllocator final {
 
 public:
   DynamicAllocator() = default;
+  DynamicAllocator(DynamicAllocator &) = delete;
+  DynamicAllocator(DynamicAllocator &&) = delete;
   ~DynamicAllocator();
 
   void cleanup();