Fix library tests

Author: calebzulawski

library/core/src/slice/mod.rs

@@ -3979,7 +3979,7 @@ impl<T> [T] {
     ///
     /// ```
     /// #![feature(portable_simd)]
-    /// use core::simd::SimdFloat;
+    /// use core::simd::prelude::*;
     ///
     /// let short = &[1, 2, 3];
     /// let (prefix, middle, suffix) = short.as_simd::<4>();
@@ -3991,7 +3991,6 @@ impl<T> [T] {
     ///
     /// fn basic_simd_sum(x: &[f32]) -> f32 {
     ///     use std::ops::Add;
-    ///     use std::simd::f32x4;
     ///     let (prefix, middle, suffix) = x.as_simd();
     ///     let sums = f32x4::from_array([
     ///         prefix.iter().copied().sum(),

library/core/src/str/pattern.rs

@@ -1740,9 +1740,9 @@ fn simd_contains(needle: &str, haystack: &str) -> Option<bool> {
     debug_assert!(needle.len() > 1);
 
     use crate::ops::BitAnd;
+    use crate::simd::cmp::SimdPartialEq;
     use crate::simd::mask8x16 as Mask;
     use crate::simd::u8x16 as Block;
-    use crate::simd::{SimdPartialEq, ToBitMask};
 
     let first_probe = needle[0];
     let last_byte_offset = needle.len() - 1;

library/core/tests/simd.rs

@@ -1,5 +1,4 @@
-use core::simd::f32x4;
-use core::simd::SimdFloat;
+use core::simd::prelude::*;
 
 #[test]
 fn testing() {