fix test for rustup

tests/compile-fail/out_of_bounds_read2.rs

@@ -1,6 +1,6 @@
 fn main() {
     let v: Vec<u8> = vec![1, 2];
     let x = unsafe { *v.as_ptr().wrapping_offset(5) }; //~ ERROR constant evaluation error
-    //~^ NOTE memory access at offset 6, outside bounds of allocation
+    //~^ NOTE outside bounds of allocation
     panic!("this should never print: {}", x);
 }