Add support for accessing field formal parameters in the initializer list of constructors

pkg/analyzer/lib/src/dart/constant/evaluation.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.src.dart.constant.evaluation;
 
 import 'dart:collection';
 
 import 'package:analyzer/context/declared_variables.dart';
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 636 matching lines @@
                     [argumentValue.type, fieldType]);
               }
             }
             String fieldName = field.name;
             if (fieldMap.containsKey(fieldName)) {
               errorReporter.reportErrorForNode(
                   CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION, node);
             }
             fieldMap[fieldName] = argumentValue;
           }
-        } else {
-          String name = baseParameter.name;
-          parameterMap[name] = argumentValue;
         }
+        String name = baseParameter.name;
+        parameterMap[name] = argumentValue;
       }
     }
     ConstantVisitor initializerVisitor = new ConstantVisitor(
         this, errorReporter,
         lexicalEnvironment: parameterMap);
     String superName = null;
     NodeList<Expression> superArguments = null;
     for (ConstructorInitializer initializer in initializers) {
       if (initializer is ConstructorFieldInitializer) {
         Expression initializerExpression = initializer.expression;
@@ skipping 1408 matching lines @@
   }
 
   @override
   String toString() {
     if (value == null) {
       return "error";
     }
     return value.toString();
   }
 }