Auto merge of #119892 - joboet:libs_use_assert_unchecked, r=Nilstrieb,cuviper

Use `assert_unchecked` instead of `assume` intrinsic in the standard library

Now that a public wrapper for the `assume` intrinsic exists, we can use it in the standard library.

CC #119131

library/core/src/lib.rs

@@ -132,6 +132,7 @@
 #![feature(const_fmt_arguments_new)]
 #![feature(const_hash)]
 #![feature(const_heap)]
+#![feature(const_hint_assert_unchecked)]
 #![feature(const_index_range_slice_index)]
 #![feature(const_int_unchecked_arith)]
 #![feature(const_intrinsic_forget)]