…able. (#12058)

Summary:
Pull Request resolved: pytorch/pytorch#12058

Methods on TensorImpl have to be written very carefully, because
when you have a VariableImpl subclass of TensorImpl, usually the
local fields on the TensorImpl are not valid; instead, you have to
forward to the "wrapped" tensor.  Functions which are virtualized
are probably handled correctly by Variable, but functions which
are NOT cannot be handled correctly and shouldn't be called if you
have a Variable.  This diff add checks to determine if this is
the case or not.

Reviewed By: jerryzh168

Differential Revision: D10034589

fbshipit-source-id: 650b2036ca9a044c0ab4abdf6f825521a64e1fc2

* upstream/master: (117 commits)
  Add full namespace resolution in CAFFE_DURATION (pytorch#12065)
  T33898723: Simple put operators for caffe2 stats (pytorch#12057)
  add narrow() support for sparse tensors re: pytorch#8853 (pytorch#11342)
  Fix ONNX bug, add symbolic for full
  Enable tracing of tensor factories with an out argument
  Fix warnings emitted when testing distributions (pytorch#12038)
  Unify versions across setup.py, libtorch, and libcaffe2 (pytorch#12053)
  add autodiff expressions for common operations (pytorch#11832)
  Blob doesn't allow access to destroyCall anymore (pytorch#11548)
  IValue can store Blob (pytorch#11414)
  Move Blob to ATen/core (pytorch#11924)
  Use tempfile during serialized test comparison (pytorch#12021)
  fix segfault when grad to a hook fn is None (pytorch#12028)
  Fallback CreateMutex/AtomicIter operators for mkl-dnn
  Unify all *_EXPORT and *_IMPORT macros across c++ backend (pytorch#12019)
  Add safety asserts for methods on TensorImpl which don't work on Variable. (pytorch#12058)
  Make USE_IDEEP work again (pytorch#12026)
  Fix "identifier following the 'template' keyword does not refer to a template" (pytorch#12037)
  Delete some unused variables. (pytorch#12059)
  Support TypeIdentifier::name() (pytorch#12036)
  ...