Fix the ScopeIterator reimplemantation.

src/compiler.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 470 matching lines @@
     ScriptDataImpl* pre_data = input_pre_data;
     int flags = kNoParsingFlags;
     if ((natives == NATIVES_CODE) || FLAG_allow_natives_syntax) {
       flags |= kAllowNativesSyntax;
     }
     if (natives != NATIVES_CODE && FLAG_harmony_scoping) {
       flags |= kHarmonyScoping;
     }
     if (pre_data == NULL
         && source_length >= FLAG_min_preparse_length) {
-      if (source->IsExternalTwoByteString()) {
-        ExternalTwoByteStringUC16CharacterStream stream(
-            Handle<ExternalTwoByteString>::cast(source), 0, source->length());
-        pre_data = ParserApi::PartialPreParse(&stream, extension, flags);
-      } else {
-        GenericStringUC16CharacterStream stream(source, 0, source->length());
-        pre_data = ParserApi::PartialPreParse(&stream, extension, flags);
-      }
+      pre_data = ParserApi::PartialPreParse(source, extension, flags);
     }
 
     // Create a script object describing the script to be compiled.
     Handle<Script> script = FACTORY->NewScript(source);
     if (natives == NATIVES_CODE) {
       script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
     }
     if (!script_name.is_null()) {
       script->set_name(*script_name);
       script->set_line_offset(Smi::FromInt(line_offset));
@@ skipping 283 matching lines @@
     }
   }
 
   GDBJIT(AddCode(Handle<String>(shared->DebugName()),
                  Handle<Script>(info->script()),
                  Handle<Code>(info->code()),
                  info));
 }
 
 } }  // namespace v8::internal