Redo "Avoid getInterceptor calls in cases were the interceptor would be constant if it were not `nu…

tests/compiler/dart2js/interceptor_almost_constant_test.dart

Index: tests/compiler/dart2js/interceptor_almost_constant_test.dart
diff --git a/tests/compiler/dart2js/interceptor_almost_constant_test.dart b/tests/compiler/dart2js/interceptor_almost_constant_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f32c3f4bbbe85ff32d38286e547957d8c4092e42
--- /dev/null
+++ b/tests/compiler/dart2js/interceptor_almost_constant_test.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:async';
+import 'package:expect/expect.dart';
+import 'package:async_helper/async_helper.dart';
+import 'compiler_helper.dart';
+
+const String TEST_ONE = r"""
+  foo(b) {
+    var a = b ? [1,2,3] : null;
+    print(a.first);
+  }
+""";
+
+main() {
+  asyncTest(() => Future.wait([
+    // Check that almost-constant interceptor is used.
+    compile(TEST_ONE, entry: 'foo', check: (String generated) {
+      String re = r'a && [\w\.]*_methods';
+      Expect.isTrue(generated.contains(new RegExp(re)), 'contains /$re/');
+    })
+  ]));
+}