Error on unsafe on non-unsafe attribute

compiler/rustc_feature/src/builtin_attrs.rs

@@ -1146,6 +1146,10 @@ pub fn is_valid_for_get_attr(name: Symbol) -> bool {
     })
 }
 
+pub fn is_unsafe_attr(name: Symbol) -> bool {
+    BUILTIN_ATTRIBUTE_MAP.get(&name).is_some_and(|attr| attr.safety == AttributeSafety::Unsafe)
+}
+
 pub static BUILTIN_ATTRIBUTE_MAP: LazyLock<FxHashMap<Symbol, &BuiltinAttribute>> =
     LazyLock::new(|| {
         let mut map = FxHashMap::default();