Tensor block evaluation V2 support for unary/binary/broadcsting

unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h

@@ -376,12 +376,17 @@ struct TensorContractionEvaluatorBase
     IsAligned         = true,
     PacketAccess      = (PacketType<CoeffReturnType, Device>::size > 1),
     BlockAccess       = false,
+    BlockAccessV2     = false,
     PreferBlockAccess = false,
     Layout            = TensorEvaluator<LeftArgType, Device>::Layout,
     CoordAccess       = false,  // to be implemented
     RawAccess         = true
   };
 
+  //===- Tensor block evaluation strategy (see TensorBlock.h) -------------===//
+  typedef internal::TensorBlockNotImplemented TensorBlockV2;
+  //===--------------------------------------------------------------------===//
+
   // Most of the code is assuming that both input tensors are ColMajor. If the
   // inputs are RowMajor, we will "cheat" by swapping the LHS and RHS:
   // If we want to compute A * B = C, where A is LHS and B is RHS, the code