delete CPUPlace and XPUPlace, test=develop

paddle/fluid/pybind/pybind.cc

@@ -1663,15 +1663,9 @@ All parameter, weight, gradient are variables in Paddle.
   m.def("is_compiled_with_mkldnn", IsCompiledWithMKLDNN);
   m.def("is_compiled_with_brpc", IsCompiledWithBrpc);
   m.def("is_compiled_with_dist", IsCompiledWithDIST);
-  m.def("_cuda_synchronize", [](const platform::XPUPlace &place) {
-    platform::DeviceContextPool::Instance().Get(place)->Wait();
-  });
   m.def("_cuda_synchronize", [](const platform::CUDAPlace &place) {
     platform::DeviceContextPool::Instance().Get(place)->Wait();
   });
-  m.def("_cuda_synchronize", [](const platform::CPUPlace &place) {
-    platform::DeviceContextPool::Instance().Get(place)->Wait();
-  });
 
   m.def("get_float_stats", []() {
     std::vector<paddle::platform::ExportedStatValue<float>> float_stats;