addr no longer exposes :)

Author: RalfJung

tests/fail/provenance/ptr_int_unexposed.rs

@@ -1,12 +1,12 @@
-// compile-flags: -Zmiri-permissive-provenance -Zmiri-disable-stacked-borrows -Zmiri-allow-ptr-int-transmute
+// compile-flags: -Zmiri-permissive-provenance -Zmiri-disable-stacked-borrows
+#![feature(strict_provenance)]
 
 fn main() {
     let x: i32 = 3;
     let x_ptr = &x as *const i32;
 
-    // TODO: switch this to addr() once we intrinsify it
-    let x_usize: usize = unsafe { std::mem::transmute(x_ptr) };
+    let x_usize: usize = x_ptr.addr();
     // Cast back a pointer that did *not* get exposed.
-    let ptr = x_usize as *const i32;
+    let ptr = std::ptr::from_exposed_addr::<i32>(x_usize);
     assert_eq!(unsafe { *ptr }, 3); //~ ERROR Undefined Behavior: dereferencing pointer failed
 }