[aot_autograd] handle subclass input mutations correctly in collect_metadata_analysis.py (#120136)
This PR fixes the issue in https://github.com/pytorch/pytorch/issues/120188.
In collect_metadata_analysis.py, handling of input/output mutations was different from handling in other locations. In other locations, MUTATED_OUT_GRAPH was used to indicate that mutation would require returning an output; in collect_metadata_analysis.py, any type of mutation was being handled as if it would require returning an output.
This PR changes collect_metadata_analysis to match other callsites and refactors computation of mutation types so that it is a property of the dataclass instead of something that needs to be computed manually when constructing an InputAliasInfo.
Differential Revision: [D53950998](https://our.internmc.facebook.com/intern/diff/D53950998)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120136
Approved by: https://github.com/bdhirsh
ghstack dependencies: #120141
