Revert "More functionality in kernel_impact." and "Compute NativeBehavior for foreign functions."

pkg/compiler/lib/src/kernel/kernel_debug.dart

 // Copyright (c) 2016, 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.
 
 /// Helper for debug Kernel nodes.
 
 library kernel.debug;
 
 import 'package:kernel/kernel.dart';
 import 'package:kernel/visitor.dart';
@@ skipping 27 matching lines @@
 
   @override
   void visitVariableGet(VariableGet node) {
     openAndCloseNode(
         node, '${node.runtimeType}', {'variable': '${node.variable}'});
   }
 
   @override
   void visitVariableDeclaration(VariableDeclaration node) {
     openNode(node, '${node.runtimeType}', {
-      'name': '${node.name ?? '--unnamed--'}',
+      'name': '${node.name}',
       'isFinal': '${node.isFinal}',
       'isConst': '${node.isConst}'
     });
     node.visitChildren(this);
     closeNode();
   }
 
   @override
   void visitInterfaceType(InterfaceType node) {
     openNode(node, '${node.runtimeType}', {
       'name': '${node.classNode.name}',
     });
     node.visitChildren(this);
     closeNode();
   }
 
   /// Pretty-prints given node tree into string.
   static String prettyPrint(Node node) {
     var p = new DebugPrinter();
     node.accept(p);
     return p.sb.toString();
   }
 }