Make JSProxies always be in slow mode

src/heap/heap.cc

 // Copyright 2012 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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 2734 matching lines @@
   }
 
   CreateFixedStubs();
 
   // Allocate the dictionary of intrinsic function names.
   Handle<NameDictionary> intrinsic_names =
       NameDictionary::New(isolate(), Runtime::kNumFunctions, TENURED);
   Runtime::InitializeIntrinsicFunctionNames(isolate(), intrinsic_names);
   set_intrinsic_function_names(*intrinsic_names);
 
+  Handle<NameDictionary> empty_properties_dictionary =
+      NameDictionary::New(isolate(), 0, TENURED);
+  empty_properties_dictionary->SetRequiresCopyOnCapacityChange();
+  set_empty_properties_dictionary(*empty_properties_dictionary);
+
   set_number_string_cache(
       *factory->NewFixedArray(kInitialNumberStringCacheSize * 2, TENURED));
 
   // Allocate cache for single character one byte strings.
   set_single_character_string_cache(
       *factory->NewFixedArray(String::kMaxOneByteCharCode + 1, TENURED));
 
   // Allocate cache for string split and regexp-multiple.
   set_string_split_cache(*factory->NewFixedArray(
       RegExpResultsCache::kRegExpResultsCacheSize, TENURED));
@@ skipping 3472 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8