dart2js: do typechecking even if suppressWarnings is on

pkg/compiler/lib/src/typechecker.dart

 // Copyright (c) 2012, 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 dart2js.typechecker;
 
 import 'common.dart';
 import 'common/names.dart' show
     Identifiers;
 import 'common/resolution.dart' show
@@ skipping 57 matching lines @@
         if (element.isField) {
           visitor.analyzingInitializer = true;
         }
         resolvedAst.node.accept(visitor);
       });
     });
   }
 }
 
 /**
- * Class used to report different warnings for differrent kinds of members.
+ * Class used to report different warnings for different kinds of members.
  */
 class MemberKind {
   static const MemberKind METHOD = const MemberKind("method");
   static const MemberKind OPERATOR = const MemberKind("operator");
   static const MemberKind GETTER = const MemberKind("getter");
   static const MemberKind SETTER = const MemberKind("setter");
 
   final String name;
 
   const MemberKind(this.name);
@@ skipping 1910 matching lines @@
 
   visitTypedef(Typedef node) {
     // Do not typecheck [Typedef] nodes.
   }
 
   visitNode(Node node) {
     reporter.internalError(node,
         'Unexpected node ${node.getObjectDescription()} in the type checker.');
   }
 }