[parser] Add default constructor for PreParserExpression

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/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/base/hashmap.h"
@@ skipping 99 matching lines @@
 
   explicit PreParserIdentifier(Type type) : type_(type) {}
   Type type_;
 
   friend class PreParserExpression;
 };
 
 
 class PreParserExpression {
  public:
+  PreParserExpression() : code_(TypeField::encode(kExpression)) {}
+
   static PreParserExpression Default() {
-    return PreParserExpression(TypeField::encode(kExpression));
+    return PreParserExpression();
   }
 
   static PreParserExpression Spread(PreParserExpression expression) {
     return PreParserExpression(TypeField::encode(kSpreadExpression));
   }
 
   static PreParserExpression FromIdentifier(PreParserIdentifier id) {
     return PreParserExpression(TypeField::encode(kIdentifierExpression) |
                                IdentifierTypeField::encode(id.type_));
   }
@@ skipping 1132 matching lines @@
     const PreParserFormalParameters& parameters, FunctionKind kind,
     FunctionLiteral::FunctionType function_type, bool* ok) {
   return pre_parser_->ParseEagerFunctionBody(function_name, pos, parameters,
                                              kind, function_type, ok);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H