viable/strict/1788983430: Make iinfo and finfo hashable (#193290)

发生了什么

iinfo and finfo compare by their stored ScalarType but did not define a matching hash. This made generated Python code objects unhashable when Dynamo preserved type-info values across graph breaks. Hash the same ScalarType field used by equality, and re-enable the integer clamp test under Dynamo. Allows one to use torch.iinfo with torch.compile (see #193288 for more details) Authored with assistance from Codex, an A…

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