Resolve references to "this" the same way as normal variables

src/scopeinfo.cc

 // Copyright 2011 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.
 
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/scopeinfo.h"
 #include "src/scopes.h"
@@ skipping 299 matching lines @@
 }
 
 
 bool ScopeInfo::LocalIsSynthetic(int var) {
   DCHECK(0 <= var && var < LocalCount());
   // There's currently no flag stored on the ScopeInfo to indicate that a
   // variable is a compiler-introduced temporary. However, to avoid conflict
   // with user declarations, the current temporaries like .generator_object and
   // .result start with a dot, so we can use that as a flag. It's a hack!
   Handle<String> name(LocalName(var));
-  return name->length() > 0 && name->Get(0) == '.';
+  return (name->length() > 0 && name->Get(0) == '.') ||
+         name->Equals(*GetIsolate()->factory()->this_string());
 }
 
 
 String* ScopeInfo::StrongModeFreeVariableName(int var) {
   DCHECK(0 <= var && var < StrongModeFreeVariableCount());
   int info_index = StrongModeFreeVariableNameEntriesIndex() + var;
   return String::cast(get(info_index));
 }
 
 
@@ skipping 328 matching lines @@
     info->set_name(i, *(it.export_name()->string()));
     info->set_mode(i, var->mode());
     DCHECK(var->index() >= 0);
     info->set_index(i, var->index());
   }
   DCHECK(i == info->length());
   return info;
 }
 
 } }  // namespace v8::internal