Implement type inference of constructor invocations in Fasta.

pkg/front_end/testcases/inference/infer_statics_transitively2.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;
 
 const /*@topType=int*/ x1 = 1;
 final /*@topType=int*/ x2 = 1;
 final /*@topType=int*/ y1 = x1;
 final /*@topType=int*/ y2 = x2;
 
 foo() {
   int i;
   i = y1;
   i = y2;
 }
+
+main() {
+  foo();
+}