Handle assert_test without useKernelInSsa

tests/compiler/dart2js/kernel/assert_test.dart

Index: tests/compiler/dart2js/kernel/assert_test.dart
diff --git a/tests/compiler/dart2js/kernel/assert_test.dart b/tests/compiler/dart2js/kernel/assert_test.dart
index 3f68b36643860ff53bf7d303ac22dc9575794ec1..700bf426effce8ad7ebbcb81d262a7193fca38c4 100644
--- a/tests/compiler/dart2js/kernel/assert_test.dart
+++ b/tests/compiler/dart2js/kernel/assert_test.dart
@@ -14,9 +14,7 @@ bool foo() => 2 + 2 == 4;
 main() {
   assert(foo());
 }''';
-    return check(code,
-        extraOptions: const <String>[Flags.enableCheckedMode],
-        useKernelInSsa: true);
+    return check(code, extraOptions: const <String>[Flags.enableCheckedMode]);
   });
 
   test('assert with message', () {
@@ -25,11 +23,9 @@ bool foo() => 2 + 2 == 4;
 main() {
   assert(foo(), "foo failed");
 }''';
-    return check(code,
-        extraOptions: const <String>[
-          Flags.enableCheckedMode,
-          Flags.enableAssertMessage,
-        ],
-        useKernelInSsa: true);
+    return check(code, extraOptions: const <String>[
+      Flags.enableCheckedMode,
+      Flags.enableAssertMessage,
+    ]);
   });
 }