resgister for ftt_r2c, ftt_c2_r (#51563)

* resgister for ftt_r2c, ftt_c2_r

* fix clang-format

paddle/fluid/framework/new_executor/interpreter/interpreter_util.cc

@@ -57,8 +57,6 @@ static std::set<std::string> OpsNeedSetOutputDtypeWhenRegisterPhiKernel = {
     "clip_by_norm",
     "eig_grad",
     "eigh",
-    "ftt_c2r",
-    "ftt_r2c",
     "graph_sample_neighbors",
     "group_norm",
     "lamb",

paddle/phi/kernels/cpu/fft_kernel.cc

@@ -27,6 +27,9 @@ PD_REGISTER_KERNEL(fft_c2r,
                    ALL_LAYOUT,
                    phi::FFTC2RKernel,
                    phi::dtype::complex<float>,
-                   phi::dtype::complex<double>) {}
+                   phi::dtype::complex<double>) {
+  kernel->OutputAt(0).SetDataType(phi::DataType::UNDEFINED);
+}
 PD_REGISTER_KERNEL(fft_r2c, CPU, ALL_LAYOUT, phi::FFTR2CKernel, float, double) {
+  kernel->OutputAt(0).SetDataType(phi::DataType::UNDEFINED);
 }

paddle/phi/kernels/gpu/fft_kernel.cu

@@ -27,6 +27,9 @@ PD_REGISTER_KERNEL(fft_c2r,
                    ALL_LAYOUT,
                    phi::FFTC2RKernel,
                    phi::dtype::complex<float>,
-                   phi::dtype::complex<double>) {}
+                   phi::dtype::complex<double>) {
+  kernel->OutputAt(0).SetDataType(phi::DataType::UNDEFINED);
+}
 PD_REGISTER_KERNEL(fft_r2c, GPU, ALL_LAYOUT, phi::FFTR2CKernel, float, double) {
+  kernel->OutputAt(0).SetDataType(phi::DataType::UNDEFINED);
 }