Pretenure mode was erroneously consulted in FastCloneShallowObjectStub.

src/code-stubs-hydrogen.cc

 // Copyright 2012 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 442 matching lines @@
   HValue* boilerplate_size = Add<HLoadNamedField>(
       boilerplate_map, HObjectAccess::ForMapInstanceSize());
   HValue* size_in_words = Add<HConstant>(object_size >> kPointerSizeLog2);
   checker.If<HCompareNumericAndBranch>(boilerplate_size,
                                        size_in_words, Token::EQ);
   checker.Then();
 
   HValue* size_in_bytes = Add<HConstant>(size);
 
   HInstruction* object = Add<HAllocate>(size_in_bytes, HType::JSObject(),
-      isolate()->heap()->GetPretenureMode(), JS_OBJECT_TYPE);
+      NOT_TENURED, JS_OBJECT_TYPE);
 
   for (int i = 0; i < object_size; i += kPointerSize) {
     HObjectAccess access = HObjectAccess::ForJSObjectOffset(i);
     Add<HStoreNamedField>(object, access,
                           Add<HLoadNamedField>(boilerplate, access));
   }
 
   ASSERT(FLAG_allocation_site_pretenuring || (size == object_size));
   if (FLAG_allocation_site_pretenuring) {
     BuildCreateAllocationMemento(
@@ skipping 858 matching lines @@
   return BuildUncheckedDictionaryElementLoad(receiver, key);
 }
 
 
 Handle<Code> KeyedLoadDictionaryElementStub::GenerateCode(Isolate* isolate) {
   return DoGenerateCode(isolate, this);
 }
 
 
 } }  // namespace v8::internal