[TensorExpr Fuser] Add support for nodes which have tensor constant inputs (#47814)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47814
Previously, we would bail completely if a node had a constant tensor input. This PR adds support for this case by lifting the constant out of the fusion graph after we've done fusion. It might be nice to add support for Tensor Constants in NNC itself, but it looked kind of tricky and this is an easy enough temporary solution.
Test Plan: Imported from OSS
Reviewed By: bertmaher
Differential Revision: D25286215
Pulled By: eellison
fbshipit-source-id: 9ff67f92f5a2d43fd3ca087569898666525ca8cf
