Fixes for a couple pattern tests.

Change-Id: I117890c1117dacac9be11bd1775e8bc42a935c52
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292500
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

tests/language/patterns/version_2_29_changes_error_test.dart

@@ -26,8 +26,9 @@ main() {
   // It's an error to have an empty map pattern.
   switch (map) {
     case {}:
+//       ^^
+// [analyzer] COMPILE_TIME_ERROR.EMPTY_MAP_PATTERN
 //  ^^^^
-// [analyzer] HINT.UNREACHABLE_SWITCH_CASE
 // [cfe] unspecified
   }
 

tests/language/patterns/version_2_29_changes_test.dart

@@ -17,11 +17,11 @@ main() {
 
   // Map patterns match even if there are extra keys.
   Expect.equals(
-      'a',
+      'a b',
       switch (map) {
+        {'a': _, 'b': _} => 'a b',
         {'a': _} => 'a',
         {'b': _} => 'b',
-        {'a': _, 'b': _} => 'a b',
         _ => '???'
       });
 }