Do not add spirv::BitcastOp for cast from signed to unsigned type.
Since MLIR integer types don't make a distinction between signed vs unsigned integers, during deserialization of SPIR-V binaries, the OpBitcast might result in a cast from/to the same type. Do not add a spv.Bitcast operation to the spv.module in these cases. PiperOrigin-RevId: 273381887
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