Add mirrors tests

test/codegen/lib/mirrors/method_mirror_location_other.dart

 // Copyright (c) 2014, 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 "package:expect/expect.dart";
+part of test.method_location;
 
-class C {
-  noSuchMethod(int x, int y) => x + y;
+class ClassInOtherFile {
+
+  ClassInOtherFile();
+
+  method() {}
 }
 
-main() {
-  Expect.throws(() => new C().foo, (e) => e is Error);
-}
+topLevelInOtherFile() {}
 
+  spaceIdentedInOtherFile() {}
 
+        tabIdentedInOtherFile() {}