Rollup merge of #145467 - Kivooeo:stabilize-strict_provenance_atomic_ptr, r=scottmcm

Stabilize `strict_provenance_atomic_ptr` feature

This closes [tracking issue](rust-lang/rust#99108) and stabilises `AtomicPtr::{fetch_ptr_add, fetch_ptr_sub, fetch_byte_add, fetch_byte_sub, fetch_or, fetch_and, fetch_xor}`

---

EDIT: FCP completed at rust-lang/rust#99108 (comment)

Author: tgross35

tests/pass/atomic.rs

@@ -2,7 +2,6 @@
 //@[tree]compile-flags: -Zmiri-tree-borrows
 //@compile-flags: -Zmiri-strict-provenance
 
-#![feature(strict_provenance_atomic_ptr)]
 // FIXME(static_mut_refs): Do not allow `static_mut_refs` lint
 #![allow(static_mut_refs)]