[LegalizeIntegerTypes] Simplify ExpandIntRes_FP_TO_XINT when operand needs to be SoftPromoted. (#107634) Create an FP_EXTEND instead of handling the soft promote directly. This FP_EXTEND will be visited and soft promoted itself. This removes a zero extend from the generated code when the f32 type is itself softened. Previously we softened it as an fp16_to_fp which sees the operand as an integer type so we extend it. When we soften the result as an fp_extend we see the source as f16 and don't extend. It only becomes an integer inside call lowering not by type legalization. If this extend is really necessary, then we have an issue when an f16->f32 fp_extend exists in the source and f32 needs to be softened. This simplifies part of #102503.
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