[es6] Make sure temporaries are not allocated in block scope

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/bootstrapper.h"
 #include "src/scopeinfo.h"
@@ skipping 546 matching lines @@
         }
 
         context_slot_cache->Update(scope_info, name, *mode, *location,
                                    *init_flag, *maybe_assigned_flag, result);
         DCHECK(result < scope_info->ContextLength());
         return result;
       }
     }
     // Cache as not found. Mode, location, init flag and maybe assigned flag
     // don't matter.
-    context_slot_cache->Update(scope_info, name, INTERNAL,
+    context_slot_cache->Update(scope_info, name, TEMPORARY,
                                VariableLocation::CONTEXT, kNeedsInitialization,
                                kNotAssigned, -1);
   }
   return -1;
 }
 
 
 int ScopeInfo::ParameterIndex(String* name) {
   DCHECK(name->IsInternalizedString());
   if (length() > 0) {
@@ skipping 268 matching lines @@
     info->set_mode(i, var->mode());
     DCHECK(var->index() >= 0);
     info->set_index(i, var->index());
   }
   DCHECK(i == info->length());
   return info;
 }
 
 }  // namespace internal
 }  // namespace v8