Add corelib tests

test/codegen/corelib/list_first_test.dart

Index: test/codegen/corelib/list_first_test.dart
diff --git a/test/codegen/language/interceptor3_test.dart b/test/codegen/corelib/list_first_test.dart
similarity index 55%
copy from test/codegen/language/interceptor3_test.dart
copy to test/codegen/corelib/list_first_test.dart
index a12172187ec342dba67ad1898a14b91c0aef9479..74be9812878727cc9af31296e7e8dbc2d3adfced 100644
--- a/test/codegen/language/interceptor3_test.dart
+++ b/test/codegen/corelib/list_first_test.dart
@@ -4,14 +4,17 @@
 
 import "package:expect/expect.dart";
 
-// Test that code motion in the presence of interceptors work in dart2js.
-
-main() {
-  var a = [2, '2'];
-  var b = a[1];
-  if (a[0] == 2 && b is String) {
-    Expect.isTrue(b.contains('2'));
+void test(List list) {
+  if (list.isEmpty) {
+    Expect.throws(() => list.first, (e) => e is StateError);
   } else {
-    b.isEven();
+    Expect.equals(list[0], list.first);
   }
 }
+
+main() {
+  test([1, 2, 3]);
+  test(const ["foo", "bar"]);
+  test([]);
+  test(const []);
+}