Add some simple sanity tests to ValueRanges (#94905)
To start, I simply test that unary/binary ops agree with reference when
the ranges are singleton.
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94905
Approved by: https://github.com/lezcano, https://github.com/eellison
