Implement type inference of constructor invocations in Fasta.

pkg/front_end/testcases/inference/instantiate_to_bounds_not_generic.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 file.
 
 /*@testedFeatures=inference*/
 library test;
 
 class A {}
 
 class B<T extends A> {}
 
 B v = null;
+
+main() {
+  v;
+}