Fix hygienic-label-x tests

Author: nagisa

src/test/compile-fail/hygienic-label-1.rs

@@ -9,9 +9,9 @@
 // except according to those terms.
 
 macro_rules! foo {
-    () => { break 'x; }
+    () => { break 'x; } //~ ERROR use of undeclared label `'x`
 }
 
 pub fn main() {
-    'x: loop { foo!() } //~ ERROR use of undeclared label `'x`
+    'x: loop { foo!() }
 }

src/test/compile-fail/hygienic-label-3.rs

@@ -9,11 +9,11 @@
 // except according to those terms.
 
 macro_rules! foo {
-    () => { break 'x; }
+    () => { break 'x; } //~ ERROR use of undeclared label `'x`
 }
 
 pub fn main() {
     'x: for _ in 0..1 {
-        foo!() //~ ERROR use of undeclared label `'x`
+        foo!()
     };
 }