Adds default move constructors to tensorflow::XlaCompiledFunction.

This class already deletes the copy constructors, but does not enable the move constructors. As written today, users of `tensorflow::XlaCompiledFunction` must wrap their instances in a `std::unique_ptr` (or similar) in order to move this instance. That solution would add indirection and proliferate null checks that is not needed after this chance.

PiperOrigin-RevId: 627474665

tensorflow/compiler/tf2xla/xla_compiled_cpu_function.h

@@ -164,6 +164,8 @@ class XlaCompiledCpuFunction {
 
   XlaCompiledCpuFunction(const XlaCompiledCpuFunction&) = delete;
   XlaCompiledCpuFunction& operator=(const XlaCompiledCpuFunction&) = delete;
+  XlaCompiledCpuFunction(XlaCompiledCpuFunction&&) = default;
+  XlaCompiledCpuFunction& operator=(XlaCompiledCpuFunction&&) = default;
 
   // Sets the intra-op thread pool used to run individual ops concurrently.
   void set_thread_pool(const Eigen::ThreadPoolDevice* pool) {