[Tosa] : Fix integer overflow for computing intmax+1 in tosa.cast to linalg. (#112455) This PR fixes an issue related to integer overflow when computing `(intmax+1)` for `i64` during `tosa-to-linalg` pass for `tosa.cast`. Found this issue while debugging a numerical mismatch for `deeplabv3` model from `torchvision` represented in `tosa` dialect using the `TorchToTosa` pipeline in `torch-mlir` repository. `torch.aten.to.dtype` is converted to `tosa.cast` that casts `f32` to `i64` type. Technically by the specification, `tosa.cast` doesn't handle casting `f32` to `i64`. So it's possible to add a verifier to error out for such tosa ops instead of producing incorrect code. However, I chose to fix the overflow issue to still be able to represent the `deeplabv3` model with `tosa` ops in the above-mentioned pipeline. Open to suggestions if adding the verifier is more appropriate instead.
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