DAG: Check if is_fpclass is custom, instead of isLegalOrCustom (#105577) For some reason, isOperationLegalOrCustom is not the same as isOperationLegal || isOperationCustom. Unfortunately, it checks if the type is legal which makes it uesless for custom lowering on non-legal types (which is always ppcf128). Really the DAG builder shouldn't be going to expand this in the builder, it makes it difficult to work with. It's only here to work around the DAG requiring legal integer types the same size as the FP type after type legalization.
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