When tracing SymInts, peephole optimize multiply by one (#85261)
This shows up a lot in graphs, so it is nice to not bother recording
useless info. On pytorch_BERT, this optimization doesn't seem to
speed anything up, so it's mostly for cleanliness.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85261
Approved by: https://github.com/wconstab
