Share int64 → int32 cast insertion pass across backends (TOSA, XNNPACK, etc.) #12957
Description
🚀 The feature, motivation and pitch
Description
In PR #12242, we used a pass InsertCastForOpsWithInt64InputPass to insert an int32 cast node to convert inputs from int64 to int32 for nodes withaten.slice_copy.Tensor in TOSA backend. This enables certain operators to be delegated to the TOSA backend, which requires int32 inputs.
Based on @digantdesai suggestions, this pass can be reused across multiple backends (TOSA, XNNPACK, etc.) that have the similar case.
Proposal
Refactor and move this pass to exir/passes so that it can be shared across multiple backends.
Alternatives
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Additional context
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RFC (Optional)
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