[TorchToLinalg] Fix i8 scalar dtype conversion by passing dstOriginalDtype #2
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This fixes an
iree-compilefailure when lowering Torch programs that require converting scalars/elements to an 8-bit integer destination (Byte/Char).convertScalarToDtyperequiresdstOriginalDtypefor i8 becauseTorchdistinguishes Byte (u8) vs Char (i8) while MLIR integers are often signless; without this metadata the helper emits unimplemented.