Function svdupq_n_s8

#[target_feature(enable = "sve")]
pub fn svdupq_n_s8(x0: i8, x1: i8, x2: i8, x3: i8, x4: i8, x5: i8, x6: i8, x7: i8, x8: i8, x9: i8, x10: i8, x11: i8, x12: i8, x13: i8, x14: i8, x15: i8) -> svint8_t