Auto merge of #77611 - oli-obk:atomic_miri_leakage, r=nagisa

Directly use raw pointers in `AtomicPtr` store/load

I was unable to find any reason for this limitation in the latest source of LLVM or in the documentation [here](http://llvm.org/docs/Atomics.html#libcalls-atomic).

fixes https://github.com/rust-lang/miri/issues/1574

src/intrinsics/mod.rs

@@ -146,12 +146,12 @@
 
 macro validate_atomic_type($fx:ident, $intrinsic:ident, $span:ident, $ty:expr) {
     match $ty.kind() {
-        ty::Uint(_) | ty::Int(_) => {}
+        ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
         _ => {
             $fx.tcx.sess.span_err(
                 $span,
                 &format!(
-                    "`{}` intrinsic: expected basic integer type, found `{:?}`",
+                    "`{}` intrinsic: expected basic integer or raw pointer type, found `{:?}`",
                     $intrinsic, $ty
                 ),
             );