Make two getters public

pkg/analyzer/lib/src/generated/resolver.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 engine.resolver;
 
 import "dart:math" as math;
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/utilities_collection.dart';
@@ skipping 11578 matching lines @@
    * type is more specific than the current type.
    *
    * @param expression the expression used to access the static element whose types might be
    *          promoted
    * @param potentialType the potential type of the elements
    */
   void _promote(Expression expression, DartType potentialType) {
     VariableElement element = getPromotionStaticElement(expression);
     if (element != null) {
       // may be mutated somewhere in closure
-      if ((element as VariableElementImpl).isPotentiallyMutatedInClosure) {
+      if (element.isPotentiallyMutatedInClosure) {
         return;
       }
       // prepare current variable type
       DartType type = _promoteManager.getType(element);
       if (type == null) {
         type = expression.staticType;
       }
       // Declared type should not be "dynamic".
       if (type == null || type.isDynamic) {
         return;
@@ skipping 3873 matching lines @@
     nonFields.add(node);
     return null;
   }
 
   @override
   Object visitNode(AstNode node) => node.accept(TypeResolverVisitor_this);
 
   @override
   Object visitWithClause(WithClause node) => null;
 }