core:vsx reimplement `v_broadcast_element()`
There's no need to use `vec_perm()` instead of `vec_splat()`, since instruction `vperm` is quite heavy compared to `vsplt[b,h,w]`.
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There's no need to use `vec_perm()` instead of `vec_splat()`, since instruction `vperm` is quite heavy compared to `vsplt[b,h,w]`.