fix UI tests

Author: RalfJung

src/test/ui/consts/const-eval/const_raw_ptr_ops.stderr

@@ -22,7 +22,7 @@ error: this constant cannot be used
 LL | const Z2: i32 = unsafe { *(42 as *const i32) }; //~ ERROR cannot be used
    | ^^^^^^^^^^^^^^^^^^^^^^^^^-------------------^^^
    |                          |
-   |                          tried to access memory with alignment 2, but alignment 4 is required
+   |                          a memory access tried to interpret some bytes as a pointer
 
 error: this constant cannot be used
   --> $DIR/const_raw_ptr_ops.rs:27:1