make src test compile, not generating llvm yet

Author: ZuseZ4

library/core/src/offload.rs

@@ -1,14 +1,27 @@
 use crate::marker::PhantomData;
-use crate::ptr;
 
 #[lang = "preload_type"]
+#[unstable(feature = "offload", issue = "124509")]
 pub struct Preload<'a, T: ?Sized> {
     cpu_ptr: *const T,
     _marker: PhantomData<&'a T>,
 }
 
 #[lang = "preload_mut_type"]
+#[unstable(feature = "offload", issue = "124509")]
 pub struct PreloadMut<'a, T: ?Sized> {
     cpu_ptr: *mut T,
     _marker: PhantomData<&'a mut T>,
 }
+
+#[lang = "preload"]
+#[unstable(feature = "offload", issue = "124509")]
+pub fn preload<'a, T: ?Sized>(x: &'a T) -> Preload<'a, T> {
+    Preload { cpu_ptr: x as *const T, _marker: PhantomData }
+}
+
+#[lang = "preload_mut"]
+#[unstable(feature = "offload", issue = "124509")]
+pub fn preload_mut<'a, T: ?Sized>(x: &'a mut T) -> PreloadMut<'a, T> {
+    PreloadMut { cpu_ptr: x as *mut T, _marker: PhantomData }
+}