Reland of "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 595 matching lines @@
   // Create temp object in the new space.
   Handle<JSArray> temp = factory->NewJSArray(FAST_ELEMENTS, NOT_TENURED);
   CHECK(isolate->heap()->new_space()->Contains(*temp));
 
   // Construct a double value that looks like a pointer to the new space object
   // and store it into the obj.
   Address fake_object = reinterpret_cast<Address>(*temp) + kPointerSize;
   double boom_value = bit_cast<double>(fake_object);
 
   FieldIndex field_index = FieldIndex::ForDescriptor(obj->map(), 0);
-  obj->FastPropertyAtPut(field_index,
-                         *factory->NewHeapNumber(boom_value, MUTABLE));
+  Handle<HeapNumber> boom_number = factory->NewHeapNumber(boom_value, MUTABLE);
+  obj->FastPropertyAtPut(field_index, *boom_number);
 
   // Enforce scan on scavenge for the obj's page.
   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