Make rc::RcBox and sync::ArcInner repr(C)

Future-proof these types in case rustc reorders
the inner fields. As per discussion in PR #68099.

src/liballoc/rc.rs

@@ -259,6 +259,10 @@ use crate::vec::Vec;
 #[cfg(test)]
 mod tests;
 
+// This is repr(C) to future-proof against possible field-reordering, which
+// would interfere with otherwise safe [into|from]_raw() of transmutable
+// inner types.
+#[repr(C)]
 struct RcBox<T: ?Sized> {
     strong: Cell<usize>,
     weak: Cell<usize>,

src/liballoc/sync.rs

@@ -270,6 +270,10 @@ impl<T: ?Sized + fmt::Debug> fmt::Debug for Weak<T> {
     }
 }
 
+// This is repr(C) to future-proof against possible field-reordering, which
+// would interfere with otherwise safe [into|from]_raw() of transmutable
+// inner types.
+#[repr(C)]
 struct ArcInner<T: ?Sized> {
     strong: atomic::AtomicUsize,