455f71d285
Add pattern that converts a `tensor.expand_shape` op to a more static form. This matches the pattern: `tensor.cast` -> `tensor.expand_shape` if it has a foldable `tensor.cast` and some constant foldable `output_shape` operands for the `tensor.expand_shape`. This makes the `tensor.expand_shape` more static, as well as allowing the static information to be propagated further down in the program.