[LoongArch] Add support for vector FP_ROUND from vxf64 to vxf32 (#164059) In LoongArch, [x]vfcvt.s.d intstructions require two vector registers for v4f64->v4f32, v8f64->v8f32 conversions. This patch handles these cases: - For FP_ROUND v2f64->v2f32(illegal), add a customized v2f32 widening to convert it into a target-specific LoongArchISD::VFCVT. - For FP_ROUND v4f64->v4f32, on LSX platforms, v4f64 is illegal and will be split into two v2f64->v2f32, resulting in two LoongArchISD::VFCVT. Finally, they are combined into a single node during combining LoongArchISD::VPACKEV. On LASX platforms, v4f64->v4f32 can directly lower to vfcvt.s.d in lowerFP_ROUND. - For FP_ROUND v8f64->v8f32, on LASX platforms, v8f64 is illegal and will be split into two v4f64->v4f32 and then combine using ISD::CONCAT_VECTORS, so we combine two ISD::FP_ROUND to LoongArchISD::VFCVT in this phase.
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