Fix location of super syntax errors

src/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_PREPARSER_H
 #define V8_PREPARSER_H
 
 #include "src/v8.h"
 
 #include "src/bailout-reason.h"
@@ skipping 2718 matching lines @@
   }
 
   result = ParseMemberExpressionContinuation(result, CHECK_OK);
   return result;
 }
 
 
 template <class Traits>
 typename ParserBase<Traits>::ExpressionT
 ParserBase<Traits>::ParseSuperExpression(bool is_new, bool* ok) {
-  int beg_pos = position();
   Expect(Token::SUPER, CHECK_OK);
 
   FunctionState* function_state = function_state_;
   while (IsArrowFunction(function_state->kind())) {
     function_state = function_state->outer();
   }
   // TODO(arv): Handle eval scopes similarly.
 
   FunctionKind kind = function_state->kind();
   if (IsConciseMethod(kind) || IsAccessorFunction(kind) ||
       i::IsConstructor(kind)) {
     if (peek() == Token::PERIOD || peek() == Token::LBRACK) {
       scope_->RecordSuperPropertyUsage();
       return this->SuperReference(scope_, factory());
     }
     // new super() is never allowed.
     // super() is only allowed in constructor
     if (!is_new && peek() == Token::LPAREN && i::IsConstructor(kind)) {
       scope_->RecordSuperConstructorCallUsage();
       return this->SuperReference(scope_, factory());
     }
   }
 
-  ReportMessageAt(Scanner::Location(beg_pos, position()), "unexpected_super");
+  ReportMessageAt(scanner()->location(), "unexpected_super");
   *ok = false;
   return this->EmptyExpression();
 }
 
 
 template <class Traits>
 typename ParserBase<Traits>::ExpressionT
 ParserBase<Traits>::ParseMemberExpressionContinuation(ExpressionT expression,
                                                       bool* ok) {
   // Parses this part of MemberExpression:
@@ skipping 304 matching lines @@
       *ok = false;
       return;
     }
     has_seen_constructor_ = true;
     return;
   }
 }
 } }  // v8::internal
 
 #endif  // V8_PREPARSER_H