Remove Type.tensor(). (pytorch#12360)

Summary:
Use at::empty instead.
Pull Request resolved: pytorch#12360

Reviewed By: ezyang

Differential Revision: D10215119

Pulled By: gchanan

fbshipit-source-id: f9bb257dff1b1bf1ecd3a6e358c4791d81b5bd31

Author: gchanan

aten/src/ATen/function_wrapper.py

@@ -780,7 +780,7 @@ def emit_nn_body(option):
             # _out variants must create buffers and insert them in the
             # arguments list between output and input arguments
             for buffer in option['buffers']:
-                body.append('Tensor {} = tensor();'.format(buffer['name']))
+                body.append('Tensor {} = at::empty({{0}}, this->options());'.format(buffer['name']))
             actuals = [arg['name'] for arg in option['arguments'] if arg.get('output')]
             actuals += [buffer['name'] for buffer in option['buffers']]
             actuals += [arg['name'] for arg in option['arguments'] if not arg.get('output')]

aten/src/ATen/native/native_functions.yaml

@@ -1901,9 +1901,6 @@
     SparseCPU: new_with_size_sparse
     SparseCUDA: new_with_size_sparse
 
-- func: tensor(Type dtype) -> Tensor
-  variants: []
-
 - func: tensor(Type dtype, IntList size) -> Tensor
   variants: []