Fix for prim::BroadcastMKLDNNTensors issue (#66628)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66628
Ensure BroadcastMKLDNNTensors do not break the stack invariant by pushing more than 2 tensors into the stack.
Reviewed By: eellison
Differential Revision: D31638565
fbshipit-source-id: 4526c0cf7ba8d87dc8a9c213c66c711e83adfc66
