Handle missing break in last switch case

tests/compiler/dart2js/kernel/switch_test.dart

 import 'package:test/test.dart';
 
 import 'helper.dart' show check;
 
 main() {
   test('simple switch statement', () {
     String code = '''
 main() {
   int x = 2;
   switch(x) {
@@ skipping 14 matching lines @@
   int x = 5;
   switch(x) {
     case 1:
       print('spider');
       break;
     case 2:
       print('grasshopper');
       break;
     default:
       print('ladybug');
-
   }
 }''';
-    return check(code, useKernelInSsa: true);
+    return check(code);
   });
 
 /*
   // TODO(efortuna): Uncomment. Because of patch file weirdness, the original
   // SSA vs the Kernel version is instantiating a subclass of the
   // FallThroughError, so it produces slightly different code. Fix that.
   test('switch with fall through error', () {
     String code = '''
 main() {
   int x = 2;
@@ skipping 39 matching lines @@
   switch(x) {
     case 1:
       print('spider');
       break;
     case 5:
       print('beetle');
       break;
     case 6:
   }
 }''';
-    return check(code, useKernelInSsa: true);
+    return check(code);
   });
 
   test('switch with labeled continue', () {
     String code = '''
 main() {
     int x = 1;
   switch(x) {
     case 1:
       print('spider');
       continue world;
@@ skipping 66 matching lines @@
       print('beetle');
       break;
     case 6:
       print('cricket');
       break;
   }
 }''';
     return check(code, useKernelInSsa: true);
   });
 }