Add support for parsing #void with Fasta.

pkg/analyzer/test/generated/parser_fasta_test.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart' as analyzer;
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/generated/parser.dart' as analyzer;
 import 'package:analyzer/src/generated/utilities_dart.dart';
@@ skipping 603 matching lines @@
   }
 
   @override
   @failingTest
   void test_parseSuperConstructorInvocation_unnamed() {
     super.test_parseSuperConstructorInvocation_unnamed();
   }
 
   @override
   @failingTest
-  void test_parseSymbolLiteral_void() {
-    super.test_parseSymbolLiteral_void();
-  }
-
-  @override
-  @failingTest
   void test_parseUnaryExpression_decrement_super() {
     super.test_parseUnaryExpression_decrement_super();
   }
 
   @override
   @failingTest
   void test_parseUnaryExpression_decrement_super_withComment() {
     super.test_parseUnaryExpression_decrement_super_withComment();
   }
 }
@@ skipping 860 matching lines @@
   void test_parseTypeAlias_genericFunction_typeParameters_voidReturnType() {
     super.test_parseTypeAlias_genericFunction_typeParameters_voidReturnType();
   }
 
   @override
   @failingTest
   void test_parseTypeAlias_genericFunction_voidReturnType() {
     super.test_parseTypeAlias_genericFunction_voidReturnType();
   }
 }