Refactor parser mode configuration for correctness

src/preparser.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 161 matching lines @@
 PreParser::SourceElements PreParser::ParseSourceElements(int end_token,
                                                          bool* ok) {
   // SourceElements ::
   //   (Statement)* <end_token>
 
   bool allow_directive_prologue = true;
   while (peek() != end_token) {
     Statement statement = ParseSourceElement(CHECK_OK);
     if (allow_directive_prologue) {
       if (statement.IsUseStrictLiteral()) {
-        set_language_mode(harmony_scoping_ ?
+        set_language_mode(allow_harmony_scoping() ?
                           i::EXTENDED_MODE : i::STRICT_MODE);
       } else if (!statement.IsStringLiteral()) {
         allow_directive_prologue = false;
       }
     }
   }
   return kUnknownSourceElements;
 }
 
 
@@ skipping 1613 matching lines @@
       backing_store_.Add(static_cast<byte>((ascii_length >> 14) | 0x80u));
     }
     backing_store_.Add(static_cast<byte>((ascii_length >> 7) | 0x80u));
   }
   backing_store_.Add(static_cast<byte>(ascii_length & 0x7f));
 
   backing_store_.AddBlock(bytes);
   return backing_store_.EndSequence().start();
 }
 } }  // v8::preparser