Merge tests for dart2js and VM using multi-tests.

tests/lib/mirrors/parameter_dart2js_test.dart

-// Copyright (c) 2013, 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.
-
-/// Test of [ParameterMirror].
-library test.parameter_test;
-
-@MirrorsUsed(targets: 'test.parameter_test', override: '*')
-import 'dart:mirrors';
-
-import 'stringify.dart';
-
-class B {
-  B();
-  B.foo(int x);
-  B.bar(int z, x);
-}
-
-main() {
-  var constructors = reflectClass(B).constructors;
-
-  expect('{B: Method(s(B) in s(B), constructor), '
-         'B.bar: Method(s(B.bar) in s(B), constructor), '
-         'B.foo: Method(s(B.foo) in s(B), constructor)}',
-         constructors);
-
-  var unnamedConstructor = constructors[new Symbol('B')];
-
-  expect('[]', unnamedConstructor.parameters);
-  expect('Class(s(B) in s(test.parameter_test), top-level)',
-         unnamedConstructor.returnType);
-
-  var fooConstructor = constructors[new Symbol('B.foo')];
-  expect('[Parameter(s(x) in s(B.foo),'
-         ' type = Class(s(int) in s(dart.core), top-level))]',
-         fooConstructor.parameters);
-  expect('Class(s(B) in s(test.parameter_test), top-level)',
-         fooConstructor.returnType);
-
-  var barConstructor = constructors[new Symbol('B.bar')];
-  expect('[Parameter(s(z) in s(B.bar),'
-         ' type = Class(s(int) in s(dart.core), top-level)), '
-         'Parameter(s(x) in s(B.bar),'
-         ' type = Type(s(dynamic), top-level))]',
-         barConstructor.parameters);
-  expect('Class(s(B) in s(test.parameter_test), top-level)',
-         barConstructor.returnType);
-
-  print(constructors);
-}