Add support for parsing #void with Fasta.

pkg/compiler/lib/src/parser/node_listener.dart

Index: pkg/compiler/lib/src/parser/node_listener.dart
diff --git a/pkg/compiler/lib/src/parser/node_listener.dart b/pkg/compiler/lib/src/parser/node_listener.dart
index 09483b257f7193a311573277e5ec30a46beaacca..f808776b1258b693647000d8599cc15761a2bbb6 100644
--- a/pkg/compiler/lib/src/parser/node_listener.dart
+++ b/pkg/compiler/lib/src/parser/node_listener.dart
@@ -736,6 +736,11 @@ class NodeListener extends ElementListener {
   }
 
   @override
+  void handleSymbolVoid(Token token) {
+    logEvent('SymbolVoid');
+  }
+
+  @override
   void handleOperatorName(Token operatorKeyword, Token token) {
     Operator op = new Operator(token);
     pushNode(new Send(new Identifier(operatorKeyword), op, null));