Merge ref '1174f784096d' from rust-lang/rust

Pull recent changes from https://github.com/rust-lang/rust via Josh.

Upstream ref: rust-lang/rust@1174f78
Filtered ref: acc3bd4
Upstream diff: rust-lang/rust@eda4fc7...1174f78

This merge was created using https://github.com/rust-lang/josh-sync.

Author: The rustc-josh-sync Cronjob Bot

crates/core_arch/src/mips/msa.rs

@@ -9187,7 +9187,6 @@ mod tests {
         core_arch::{mips::msa::*, simd::*},
         mem,
     };
-    use std::{f32, f64};
     use stdarch_test::simd_test;
 
     #[simd_test(enable = "msa")]