Move long-running test to its own test-file.

tests/compiler/dart2js/serialization/compilation0_test.dart

Index: tests/compiler/dart2js/serialization/compilation0_test.dart
diff --git a/tests/compiler/dart2js/serialization/compilation1_test.dart b/tests/compiler/dart2js/serialization/compilation0_test.dart
similarity index 88%
copy from tests/compiler/dart2js/serialization/compilation1_test.dart
copy to tests/compiler/dart2js/serialization/compilation0_test.dart
index 3244d79116f284a75eeebb451fd34f499931cc78..fb7c8bf53b0c0777cbe62449548fe87680281314 100644
--- a/tests/compiler/dart2js/serialization/compilation1_test.dart
+++ b/tests/compiler/dart2js/serialization/compilation0_test.dart
@@ -8,5 +8,5 @@ import 'compilation_test_helper.dart' as test;
 import 'test_data.dart';
 
 main() {
-  test.main(['0', '${TESTS.length ~/ 4}']);
+  test.main(['0', '0']);
 }