Don't use std::same_v

It is not supported in C++14.

PiperOrigin-RevId: 344021338
Change-Id: I4027ed717bc43bb42bf0bc4796f7bb635361d70e

tensorflow/core/kernels/mlir_generated/gpu_unary_ops_test.cc

@@ -60,7 +60,7 @@ class GpuUnaryOpTest : public OpsTestBase {
     NodeDefBuilder builder("some_name", op_name);
     builder.Input(FakeInput(DataTypeToEnum<T>::v()))
         .Attr("T", DataTypeToEnum<T>::v());
-    if (!std::is_same_v<OutT, T>) {
+    if (!std::is_same<OutT, T>::value) {
       builder.Attr("Tout", DataTypeToEnum<OutT>::v());
     }
     TF_ASSERT_OK(builder.Finalize(node_def()));