fix symint meta val (#107491)
`aot_export` adds metadata for int inputs as symints. This diff turns such metadata into ints since they will be specialized anyway. We don't turn these into runtime assertions yet (but should, as future work).
Differential Revision: D48487562
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107491
Approved by: https://github.com/gmagogsfm
