[mlir][tosa][tosa-to-linalg] Ignore Int NaN Mode (#129041) For non floating point operations NaN propagation mode has no meaning and can be safely ignored. For non integer types skip the compare and select materialization for NaN propagation even in "IGNORE" mode. This fixes a bug where an unchecked `cast<FloatType>()` was called in the "IGNORE" case even when the operation is acting on integers. Update the lit tests for the NaN propagation lowering to check that the propagation logic is not materialized in the case of a non floating point type e.g. i8. Signed-off-by: Jack Frankland <jack.frankland@arm.com>
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