Don't use guardless contiguity/stride-like implementations (#95733)
These prevent us from simplifying tests involving unbacked SymInts,
and then you end up with unbacked SymInt in guards, which is bad.
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/95733
Approved by: https://github.com/tugsbayasgalan
