Fix parsing [a]sync[*] function body modifiers 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 40 matching lines @@
 class ClassMemberParserTest_Fasta extends FastaParserTestCase
     with ClassMemberParserTestMixin {
   @override
   @failingTest
   void test_constFactory() {
     // TODO(paulberry): Unhandled event: ConstructorReference
     super.test_constFactory();
   }
 
   @override
-  @assertFailingTest
-  void test_parseAwaitExpression_asStatement_inAsync() {
-    // TODO(paulberry): Add support for async
-    super.test_parseAwaitExpression_asStatement_inAsync();
-  }
-
-  @override
   @failingTest
   void test_parseClassMember_constructor_withInitializers() {
     // TODO(paulberry): 'this' can't be used here.
     super.test_parseClassMember_constructor_withInitializers();
   }
 
   @override
   @failingTest
   void test_parseClassMember_field_covariant() {
     // TODO(paulberry): Unhandled event: Fields
@@ skipping 425 matching lines @@
   }
 
   @override
   @failingTest
   void test_parseExpression_assign_compound() {
     super.test_parseExpression_assign_compound();
   }
 
   @override
   @failingTest
-  void test_parseExpression_function_async() {
-    super.test_parseExpression_function_async();
-  }
-
-  @override
-  @failingTest
-  void test_parseExpression_function_asyncStar() {
-    super.test_parseExpression_function_asyncStar();
-  }
-
-  @override
-  @failingTest
-  void test_parseExpression_function_syncStar() {
-    super.test_parseExpression_function_syncStar();
-  }
-
-  @override
-  @failingTest
   void test_parseExpression_superMethodInvocation_typeArgumentComments() {
     super.test_parseExpression_superMethodInvocation_typeArgumentComments();
   }
 
   @override
   @failingTest
   void
       test_parseExpressionWithoutCascade_superMethodInvocation_typeArgumentComments() {
     super
         .test_parseExpressionWithoutCascade_superMethodInvocation_typeArgumentComments();
@@ skipping 1088 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();
   }
 }