Auto merge of #81047 - glittershark:stabilize-cmp-min-max-by, r=kodraus

Stabilize cmp_min_max_by

I would like to propose cmp::{min_by, min_by_key, max_by, max_by_key}
for stabilization.

These are relatively simple and seemingly uncontroversial functions and
have been unchanged in unstable for a while now.

Closes: #64460

diff --cc compiler/rustc_middle/src/lib.rs
Simple merge

diff --cc library/core/src/cmp.rs
Simple merge

diff --cc library/core/tests/lib.rs
index 1d885eb1092da04bd6c6856ce2729a0c8076cfab,6b668c80d3854a228a2f5d88514b943889678e7d..a96520680e309ef73050c0cef9adc323ed93ff8a
--- 1/library/core/tests/lib.rs
--- 2/library/core/tests/lib.rs
+++ b/library/core/tests/lib.rs
@@@ -52,12 -45,11 +52,11 @@@
  #![feature(slice_internals)]
  #![feature(slice_partition_dedup)]
  #![feature(int_error_matching)]
 -#![feature(array_value_iter)]
  #![feature(iter_advance_by)]
  #![feature(iter_partition_in_place)]
 +#![feature(iter_intersperse)]
  #![feature(iter_is_partitioned)]
  #![feature(iter_order_by)]
- #![feature(cmp_min_max_by)]
  #![feature(iter_map_while)]
  #![feature(const_mut_refs)]
  #![feature(const_pin)]