More functionality in kernel_impact.

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

Index: pkg/compiler/lib/src/kernel/kernel_debug.dart
diff --git a/pkg/compiler/lib/src/kernel/kernel_debug.dart b/pkg/compiler/lib/src/kernel/kernel_debug.dart
index 725e2d1a6b600dc9195159aa825c4abc42f22093..f86a6a22dc538edbf66994da0cba177cf3ca0e81 100644
--- a/pkg/compiler/lib/src/kernel/kernel_debug.dart
+++ b/pkg/compiler/lib/src/kernel/kernel_debug.dart
@@ -45,7 +45,7 @@ class DebugPrinter extends Visitor with Indentation, Tagging<Node> {
   @override
   void visitVariableDeclaration(VariableDeclaration node) {
     openNode(node, '${node.runtimeType}', {
-      'name': '${node.name}',
+      'name': '${node.name ?? '--unnamed--'}',
       'isFinal': '${node.isFinal}',
       'isConst': '${node.isConst}'
     });