[async-await] (simpler) fix for Return in try/finally in async functions

src/parsing/preparser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PREPARSER_H
 #define V8_PARSING_PREPARSER_H
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/parsing/parser-base.h"
@@ skipping 652 matching lines @@
   }
   PreParserExpression NewCallNew(PreParserExpression expression,
                                  PreParserExpressionList arguments,
                                  int pos) {
     return PreParserExpression::Default();
   }
   PreParserStatement NewReturnStatement(PreParserExpression expression,
                                         int pos) {
     return PreParserStatement::Jump();
   }
+  PreParserStatement NewAsyncReturnStatement(PreParserExpression expression,
+                                             int pos) {
+    return PreParserStatement::Jump();
+  }
   PreParserExpression NewFunctionLiteral(
       PreParserIdentifier name, Scope* scope, PreParserStatementList body,
       int materialized_literal_count, int expected_property_count,
       int parameter_count, int function_length,
       FunctionLiteral::ParameterFlag has_duplicate_parameters,
       FunctionLiteral::FunctionType function_type,
       FunctionLiteral::EagerCompileHint eager_compile_hint, int position,
       bool has_braces, int function_literal_id) {
     return PreParserExpression::Default();
   }
@@ skipping 1010 matching lines @@
     function_state_->NextMaterializedLiteralIndex();
     function_state_->NextMaterializedLiteralIndex();
   }
   return EmptyExpression();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H