indexing_dtype_strength_reduction more aggressive free_symbols tests (#103470)
ValueRanges can't handle symbolic bounds. Be a bit more careful about detecting if you try to pass in expressions with free symbols, and fall back to "don't know" range if this occurs.
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/103470
Approved by: https://github.com/eellison
