Fix _mm_loadu_si64 test

Author: pickfire

crates/core_arch/src/x86/sse.rs

@@ -3674,7 +3674,7 @@ mod tests {
 
     #[simd_test(enable = "sse2")]
     unsafe fn test_mm_loadu_si64() {
-        let a = _mm_set_epi64x(5, 0);
+        let a = _mm_set_epi8(0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0);
         let r = _mm_loadu_si64(&a as *const _ as *const _);
         assert_eq_m128i(a, r);
     }