[es6] More efficient way of marking AST call expressions in tail positions.

src/parsing/parser.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_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 884 matching lines @@
   CaseClause* ParseCaseClause(bool* default_seen_ptr, bool* ok);
   Statement* ParseSwitchStatement(ZoneList<const AstRawString*>* labels,
                                   bool* ok);
   DoWhileStatement* ParseDoWhileStatement(ZoneList<const AstRawString*>* labels,
                                           bool* ok);
   WhileStatement* ParseWhileStatement(ZoneList<const AstRawString*>* labels,
                                       bool* ok);
   Statement* ParseForStatement(ZoneList<const AstRawString*>* labels, bool* ok);
   Statement* ParseThrowStatement(bool* ok);
   Expression* MakeCatchContext(Handle<String> id, VariableProxy* value);
+  class DontCollectExpressionsInTailPositionScope;
+  class CollectExpressionsInTailPositionToListScope;
   TryStatement* ParseTryStatement(bool* ok);
   DebuggerStatement* ParseDebuggerStatement(bool* ok);
 
   // !%_IsJSReceiver(result = iterator.next()) &&
   //     %ThrowIteratorResultNotAnObject(result)
   Expression* BuildIteratorNextResult(Expression* iterator, Variable* result,
                                       int pos);
 
 
   // Initialize the components of a for-in / for-of statement.
@@ skipping 303 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_