Record names of constructors and use that to implement Object.toString.

dart/frog/tests/leg/src/ClassCodegenTest.dart

 // Copyright (c) 2011, 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 that parameters keep their names in the output.
 
 #import("compiler_helper.dart");
 #import("parser_helper.dart");
 
 final String TEST_ONE = @"""
 class A { }
@@ skipping 46 matching lines @@
   A(x) : this.x = x {}
 }
 
 main() {
   new A(3);
 }
 """;
 
 twoClasses() {
   String generated = compileClasses(TEST_ONE);
-  Expect.isTrue(generated.contains("Isolate.prototype.A2 = function() {\n};"));
-  Expect.isTrue(generated.contains("Isolate.prototype.B2 = function() {\n};"));
+  Expect.isTrue(generated.contains("Isolate.prototype.A2 = function A() {\n};"));
+  Expect.isTrue(generated.contains("Isolate.prototype.B2 = function B() {\n};"));
 }
 
 subClass() {
   checkOutput(String generated) {
     Expect.isTrue(
-        generated.contains("Isolate.prototype.A2 = function() {\n};"));
+        generated.contains("Isolate.prototype.A2 = function A() {\n};"));
     Expect.isTrue(
-        generated.contains("Isolate.prototype.B2 = function() {\n};"));
+        generated.contains("Isolate.prototype.B2 = function B() {\n};"));
     Expect.isTrue(generated.contains(@"Isolate.$inherits = function"));
     Expect.isTrue(generated.contains(
         "Isolate.\$inherits(Isolate.prototype.B2, Isolate.prototype.A2);\n"));
   }
 
   checkOutput(compileClasses(TEST_TWO));
   checkOutput(compileClasses(TEST_THREE));
 }
 
 fieldTest() {
   String generated = compileClasses(TEST_FOUR);
   Expect.isTrue(generated.contains("""
-Isolate.prototype.B2 = function(B_z, B_y, A_x) {
+Isolate.prototype.B2 = function B(B_z, B_y, A_x) {
   this.z = B_z;
   this.y = B_y;
   this.x = A_x;
 };"""));
 }
 
 constructor1() {
   String generated = compileClasses(TEST_FIVE);
   Expect.isTrue(generated.contains("new \$.A2(x);"));
 }
 
 main() {
   twoClasses();
   subClass();
   fieldTest();
   constructor1();
 }