update

Author: aaishwarymishra

library/core/src/intrinsics/mod.rs

@@ -1323,6 +1323,8 @@ pub unsafe fn atomic_singlethreadfence_acqrel() {
 /// ranging from (0) - no locality, to (3) - extremely local keep in cache.
 ///
 /// This intrinsic does not have a stable counterpart.
+#[rustc_intrinsic]
+#[rustc_intrinsic_must_be_overridden]
 #[rustc_nounwind]
 pub unsafe fn prefetch_read_data<T>(_data: *const T, _locality: i32) {
     unreachable!()