fix compile-fail tests for latest rustc

rust-version

@@ -1 +1 @@
-97b1128589fdaa786a7cf65c5a6ff7ed37a1d2f3
+d36b7f69448f7390fa9dfde75d58b914365acdab

tests/compile-fail/validity/dangling_ref1.rs

@@ -1,5 +1,5 @@
 use std::mem;
 
 fn main() {
-    let _x: &i32 = unsafe { mem::transmute(16usize) }; //~ ERROR integer pointer in non-ZST reference
+    let _x: &i32 = unsafe { mem::transmute(16usize) }; //~ ERROR dangling reference (created from integer)
 }

tests/compile-fail/validity/dangling_ref2.rs

@@ -3,5 +3,5 @@ use std::mem;
 fn main() {
     let val = 14;
     let ptr = (&val as *const i32).wrapping_offset(1);
-    let _x: &i32 = unsafe { mem::transmute(ptr) }; //~ ERROR encountered dangling (not entirely in bounds) reference
+    let _x: &i32 = unsafe { mem::transmute(ptr) }; //~ ERROR dangling reference (not entirely in bounds)
 }