In-object double fields unboxing (for 64-bit only).

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index 7fa2a99327383413c1ac0cec25142075ee6fde0d..1db8ef78c787befe9451d3adf484b39d5c62ed7e 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -2324,12 +2324,17 @@ TEST(OptimizedPretenuringMixedInObjectProperties) {
   FieldIndex idx1 = FieldIndex::ForPropertyIndex(o->map(), 0);
   FieldIndex idx2 = FieldIndex::ForPropertyIndex(o->map(), 1);
   CHECK(CcTest::heap()->InOldPointerSpace(o->RawFastPropertyAt(idx1)));
-  CHECK(CcTest::heap()->InOldDataSpace(o->RawFastPropertyAt(idx2)));
+  if (!FLAG_unbox_double_fields) {
+    CHECK(CcTest::heap()->InOldDataSpace(o->RawFastPropertyAt(idx2)));
+  }
 
   JSObject* inner_object =
       reinterpret_cast<JSObject*>(o->RawFastPropertyAt(idx1));
   CHECK(CcTest::heap()->InOldPointerSpace(inner_object));
-  CHECK(CcTest::heap()->InOldDataSpace(inner_object->RawFastPropertyAt(idx1)));
+  if (!FLAG_unbox_double_fields) {
+    CHECK(
+        CcTest::heap()->InOldDataSpace(inner_object->RawFastPropertyAt(idx1)));
+  }
   CHECK(CcTest::heap()->InOldPointerSpace(
       inner_object->RawFastPropertyAt(idx2)));
 }