Rollup merge of #77009 - est31:dogfood_total_cmp, r=lcnr

Dogfood total_cmp in the test crate

Author: RalfJung

library/test/src/lib.rs

@@ -29,6 +29,7 @@
 #![feature(staged_api)]
 #![feature(termination_trait_lib)]
 #![feature(test)]
+#![feature(total_cmp)]
 
 // Public reexports
 pub use self::bench::{black_box, Bencher};

library/test/src/stats.rs

@@ -1,29 +1,13 @@
 #![allow(missing_docs)]
 #![allow(deprecated)] // Float
 
-use std::cmp::Ordering::{self, Equal, Greater, Less};
 use std::mem;
 
 #[cfg(test)]
 mod tests;
 
-fn local_cmp(x: f64, y: f64) -> Ordering {
-    // arbitrarily decide that NaNs are larger than everything.
-    if y.is_nan() {
-        Less
-    } else if x.is_nan() {
-        Greater
-    } else if x < y {
-        Less
-    } else if x == y {
-        Equal
-    } else {
-        Greater
-    }
-}
-
 fn local_sort(v: &mut [f64]) {
-    v.sort_by(|x: &f64, y: &f64| local_cmp(*x, *y));
+    v.sort_by(|x: &f64, y: &f64| x.total_cmp(y));
 }
 
 /// Trait that provides simple descriptive statistics on a univariate set of numeric samples.