Rename internal_convert_to_tensor for performance
Rename internal_convert_to_tensor for performance

Calling ops.internal_convert_to_tensor is more efficient than calling
ops.convert_to_tensor due to skipping the deprecated_argument_lookup and
also less python function calling overhead. We thus swap these functions
names so we can optimize most code paths.

PiperOrigin-RevId: 274321742

tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor