Enable inobject double fields unboxing for 64-bit archs.

test/cctest/test-unboxed-doubles.cc

 // Copyright 2014 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 <utility>
 
 #include "src/v8.h"
 
 #include "src/compilation-cache.h"
@@ skipping 19 matching lines @@
     return HeapNumber::cast(value)->value();
   }
 }
 
 
 enum PropertyKind {
   PROP_CONSTANT,
   PROP_SMI,
   PROP_DOUBLE,
   PROP_TAGGED,
-  PROP_KIND_NUMBER,
+  PROP_KIND_NUMBER
 };
 
 static Representation representations[PROP_KIND_NUMBER] = {
     Representation::None(), Representation::Smi(), Representation::Double(),
     Representation::Tagged()};
 
 
 static Handle<DescriptorArray> CreateDescriptorArray(Isolate* isolate,
                                                      PropertyKind* props,
                                                      int kPropsCount) {
@@ skipping 609 matching lines @@
   MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
   chunk->set_scan_on_scavenge(true);
 
   // Trigger GCs and force evacuation. Should not crash there.
   CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
 
   CHECK_EQ(boom_value, GetDoubleFieldValue(*obj, field_index));
 }
 
 #endif