Instrument analyzer's type analysis and run front_end inference tests.

pkg/front_end/testcases/inference/local_constructor_from_arguments.dart

+// Copyright (c) 2017, 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.md file.
+
+/*@testedFeatures=inference*/
+library test;
+
+class C<T> {
+  T t;
+  C(this.t);
+}
+
+main() {
+  var /*@type=C<int>*/ x = /*@type=C<int>*/ new C(42);
+
+  num y;
+  C<int> c_int = /*@type=C<int>*/ new C(
+      /*info:DOWN_CAST_IMPLICIT*/ /*@promotedType=none*/ y);
+
+  C<num> c_num = /*@type=C<num>*/ new C(123);
+
+  // Don't infer from explicit dynamic.
+  var /*@type=C<dynamic>*/ c_dynamic = new C<dynamic>(42);
+}