[vectorapi] Implement the missing intrinsics for casting from integrals on x64

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      Implement VectorCastL2X for float and double results on non-avx512dq.
      Implement VectorCastB2X and VectorCastS2X with 256-bit float results on avx1.

            Assignee:
            Quan Anh Mai
            Reporter:
            Quan Anh Mai
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