[es6] Introduce spec compliant IsConstructor.

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/bailout-reason.h"
 #include "src/expression-classifier.h"
 #include "src/func-name-inferrer.h"
@@ skipping 2210 matching lines @@
   int end_pos = scanner()->peek_location().end_pos;
   ExpressionT result = this->EmptyExpression();
   Token::Value token = peek();
   switch (token) {
     case Token::THIS: {
       BindingPatternUnexpectedToken(classifier);
       Consume(Token::THIS);
       if (FLAG_strong_this && is_strong(language_mode())) {
         // Constructors' usages of 'this' in strong mode are parsed separately.
         // TODO(rossberg): this does not work with arrow functions yet.
-        if (i::IsConstructor(function_state_->kind())) {
+        if (IsClassConstructor(function_state_->kind())) {
           ReportMessage(MessageTemplate::kStrongConstructorThis);
           *ok = false;
           break;
         }
       }
       result = this->ThisExpression(scope_, factory(), beg_pos);
       break;
     }
 
     case Token::NULL_LITERAL:
@@ skipping 1363 matching lines @@
 typename ParserBase<Traits>::ExpressionT
 ParserBase<Traits>::ParseSuperExpression(bool is_new,
                                          ExpressionClassifier* classifier,
                                          bool* ok) {
   int pos = position();
   Expect(Token::SUPER, CHECK_OK);
 
   Scope* scope = scope_->ReceiverScope();
   FunctionKind kind = scope->function_kind();
   if (IsConciseMethod(kind) || IsAccessorFunction(kind) ||
-      i::IsConstructor(kind)) {
+      IsClassConstructor(kind)) {
     if (peek() == Token::PERIOD || peek() == Token::LBRACK) {
       scope->RecordSuperPropertyUsage();
       return this->SuperPropertyReference(scope_, factory(), pos);
     }
     // new super() is never allowed.
     // super() is only allowed in derived constructor
     if (!is_new && peek() == Token::LPAREN && IsSubclassConstructor(kind)) {
       if (is_strong(language_mode())) {
         // Super calls in strong mode are parsed separately.
         ReportMessageAt(scanner()->location(),
@@ skipping 552 matching lines @@
       *ok = false;
       return;
     }
     has_seen_constructor_ = true;
     return;
   }
 }
 } }  // v8::internal
 
 #endif  // V8_PREPARSER_H