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

src/contexts.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 "src/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/scopeinfo.h"
 
@@ skipping 122 matching lines @@
     return Nothing<PropertyAttributes>();
   }
   return blacklist->BooleanValue() ? Just(ABSENT) : attrs;
 }
 
 static void GetAttributesAndBindingFlags(VariableMode mode,
                                          InitializationFlag init_flag,
                                          PropertyAttributes* attributes,
                                          BindingFlags* binding_flags) {
   switch (mode) {
-    case INTERNAL:  // Fall through.
     case VAR:
       *attributes = NONE;
       *binding_flags = MUTABLE_IS_INITIALIZED;
       break;
     case LET:
       *attributes = NONE;
       *binding_flags = (init_flag == kNeedsInitialization)
                            ? MUTABLE_CHECK_INITIALIZED
                            : MUTABLE_IS_INITIALIZED;
       break;
@@ skipping 357 matching lines @@
   // During bootstrapping we allow all objects to pass as global
   // objects. This is necessary to fix circular dependencies.
   return isolate->heap()->gc_state() != Heap::NOT_IN_GC ||
       isolate->bootstrapper()->IsActive() ||
       object->IsGlobalObject();
 }
 #endif
 
 }  // namespace internal
 }  // namespace v8