[X86] Improve v4i32->v4f64 uint_to_fp for AVX1/AVX2 targets.
Use zext+or+fsub to do the conversion. Similar to D71971. Differential Revision: https://reviews.llvm.org/D71971
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Use zext+or+fsub to do the conversion. Similar to D71971. Differential Revision: https://reviews.llvm.org/D71971